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Camera Lens

Camera Lens

Background

The camera lens is an invention that attempts to duplicate the operation of the human eye. Just like the eye, the lens sees an image, focuses it, and transmits its colors, sharpness, and brightness through the camera to the photographic film, which, like our memory, records the image for processing and future use. Lenses are made of optical glass or plastic. They focus light rays by refracting or bending them so that they meet or converge at a common point.

A simple lens "sees" well through its center, but its vision around the edges tends to blur. Blurring, color changes, distortion of lines, and color halos around objects are caused by defects in the lens called aberrations. Some aberrations can be corrected in the simple lens by shaping one or both surfaces so they are aspheric; aspheric curves vary like the curves of a parabola, rather than staying constant like the curvature of a sphere. A camera lens reduces the effects of aberrations by replacing a simple lens with a group of lenses called lens elements, which are lenses of different shapes and distances of separation. The lens becomes more complex as greater correction of vision is achieved. The lens will also be more complex depending on the size of the aperturethe opening that allows light to pass throughand the range of angles it "sees." Lens design used to rely on the optician's art and considerable experimentation. Today, computer programs can adjust the shaping and spacing of lens elements, determine their effects on each other, and evaluate costs of lens production.

Lens elements are usually described by their shape. The convex lens curves outward; a biconvex lens curves outward on both sides, and a plano-convex lens is flat on one side and outwardly curved on the other. There are also concave lenes, biconcave, and plano-concave lenses. The elements are not necessarily symmetrical and can curve more on one side than the other. Thickening the middle of the lens relative to its edges causes light rays to converge or focus. Lenses with thick edges and thin middles make light rays disperse. A complex camera lens contains a number of elements specially grouped. The combination of the composition, shape, and grouping of the elements maximizes the light-bending properties of the individual elements to produce the desired image. The lens is focused by moving it nearer or farther from the film or focal plane. The lens can be twisted, causing the lens elements to move in and out along a spiral screw thread machined into the casing of the lens. Twisting the lens also moves a scale on the casing that shows the distance of the best focus.

The stop or diaphragm is a specialized part of the lens. In simple cameras, the stop is a fixed stop or a ring of black sheet metal that is permanently set in front of the lens. Box cameras, studio cameras, and some cameras of European manufacture use a sliding stop, which is a strip of metal that slides across the front of the lens between grooves. It has two or more holes of different sizes that are the apertures. Lenses with a variable stop have a machined ring on the outside of the lens mount, printed with f-stop numbers. By turning this ring, the diaphragm can be opened or closed. This iris diaphragm works much like the iris of the eye in allowing adjustments for varied light conditions.

The lens in a compact camera is usually a general-purpose lens with a normnal focal length that takes pictures of an image the way our eyes see it. Lenses designed for special purposes are used with more advanced cameras. Telephoto lenses work much like binoculars or telescopes, and make a distant image appear closer. Wide-angle lenses make the image appear farther away; a panoramic lens is a special kind of wide-angle lens that is useful for taking pictures of broad expanses of scenery. Some disposable cameras are equipped with panoramic lenses. A fish-eye lens is also a special kind of wide-angle lens that deliberately distorts the image so the central part is enlarged and the outer image details are compressed. Fish-eye lenses cover very wide angles like horizon-to-horizon views. Another special purpose lens is the variable-focus lens, also called a "zoom" lens. It uses moveable lens elements to adjust the focal length to zoom closer to or farther away from the subject. These lenses are complex and may contain 12 to 20 lens elements; however, one variable-focus lens may replace several other lenses. Some compact cameras also have limited zoom, telephoto, or wide-angle features. The single-lens reflex (SLR) camera is made so that the photographer sees the same view as the lens through the viewfinder. This enables the photographer to plan the image that will appear on film with the flexibility of a variety of interchangeable lenses.

History

The camera lens evolved from optical lenses developed for other purposes, and matured with the camera and photographic film. In 1568, a Venetian nobleman, Daniel Barbaro, placed a lens over the hole in a camera box and studied sharpness of image and focus. His first lens was from an old man's convex spectacles. The astronomer Johann Kepler elaborated on Barbaro's experiments in 1611 by describing single and compound lenses, explaining image reversal, and enlarging images by grouping convex and concave lenses.

In the 1800s, the first box cameras had a lens mounted in the opening in the box. The lens inverted the image on a light-sensitive plate at the back of the box. There was no shutter to open the lens; instead, a lens cap was removed for several seconds or longer to expose the plate. Improvements in the sensitivity of the plate necessitated ways of controlling the exposure. Masks with different sized openings were made for insertion near the lens. The iris diaphragm was also developed to control the aperture. Its metal leaves open and close together to form a circular opening that can be varied in diameter.

In 1841, Joseph Petzval of Vienna designed a portrait lens with a fast aperture. Previously, lenses made for daguerreotype cameras were best suited for landscape photography. Petzval's lens allowed portraits to be taken ten times faster, and the photograph was less likely to be blurred. In 1902, Paul Rudolph developed the Zeiss Tessar lens, considered the most popular ever created. In 1918, he produced the Plasmat lens, which may be the finest camera lens ever made. Rudolph was followed shortly by Max Berek, who designed sharp, fast lenses that were ideal for miniature cameras.

Other essential developments in lens history include lens coating technology, use of rare-earth glass, and calculation methods made possible by the computer. Katharine B. Blodgett developed techniques for thin-coating lenses with soap film to remove reflection and improve light transmission in 1939. C. Hawley Cartwright continued Blodgett's work by using coatings of metallic fluorides, including evaporated magnesium and calcium that were four-one-millionths of an inch thick.

Design

Design of a camera lens begins by identifying the photographer who will use it. When the market is identified, the lens designer selects the optical and mechanical materials, the optical design, the appropriate method for making the mechanical parts, and, for auto focus lenses, the type of inter-face between the lens and camera. There are conventions or patterns for the different categories of lenses, including macro, wide-angle, and telephoto lenses, so some design aspects are standardized. Advancements in materials give designers many challenging options, however. In selecting materials, the engineer must consider a range of metals for the components and various types of glasses and plastics for the lenses, all the while mindful of the final cost to the photographer.

When the designer has completed the design, its performance is tested by computer simulation. Computer programs that are specific to lens manufacturers tell the designer what kind of image or picture the lens will produce at the center of the image and at its edges for the range of lens operation. Assuming the lens passes the computer simulation test, the criteria for performance that were chosen initially are reviewed again to confirm that the lens meets the needs identified. A prototype is manufactured to test actual performance. The lens is tested under varying temperature and environmental conditions, at every aperture position, and at every focal length for zoom lenses. Target charts in a laboratory are photographed, as are field conditions of varying light and shadow. Some lenses are aged rapidly in laboratory tests to check their durability.

Additional design work is needed if the lens focuses automatically, because the auto focus (AF) module must work with a range of camera bodies. The AF module requires both software and mechanical design. Extensive prototype testing is performed on these lenses because of their complex functions and because the software is fine-tuned to each lens.

Raw Materials

The raw materials for the lenses themselves, the coating, the barrel, or housing for the camera lens, and lens mounts are described below in the manufacturing section.

The Manufacturing
Process

Grinding and polishing lens elements

  • 1 Optical glass is supplied to lens manufacturers by specialized vendors. Usually, it is provided as a "pressed plate" or sliced glass plate from which the elements are cut. The glass elements are shaped to concave or convex forms by a curve generator machine that is a first-step grinder. To reach the specifications for its shape, a lens goes through a sequence of processes in which it is ground by polishing particles in water. The polishing particles become smaller in each step as the lens is refined. Curve generation and subsequent grinding vary in speed depending on the frailty, softness, and oxidation properties of the optical materials.

    After grinding and polishing, the elements are centered so that the outer edge of the lens is perfect in circumference relative to the centerline or optical axis of the lens. Lenses made of plastic or bonded glass and resin are produced by the same processes. Bonded materials are used to make lenses with non-spherical surfaces, and these lenses are called "hybrid aspherics." The aspherical surfaces of these lenses are completed during centering.

Coating lenses

  • 2 Formed lenses are coated to protect the material from oxidation, to prevent reflections, and to meet requirements for "designed spectrum transmission" or color balance and rendition. The lens surfaces are carefully cleaned before coating. Techniques for applying coatings and the coatings themselves are major selling points for a manufacturer's lenses and are carefully guarded secrets. Some types of coatings include metal oxides, light-alloy fluorides, and layers of quartz that are applied to lenses and mirrors by a vacuum process. Several layers of coating may be applied for the best color and light transmission, but excessive coating can reduce the light that passes through the lens and limit its usefulness.

Producing the barrel

  • 3 The barrel includes the chassis that supports the various lens elements and the cosmetic exterior. Metal mounts, grooves, and moving portions of the lens are critical to the performance of the lens, and are machined to very specific tolerances. Lens mounts may be made of brass, aluminum, or plastic. Most metal barrel components are die-cast and machined. Metal mounts last longer, maintain their dimensions, can be machined more precisely, and can be dismantled to replace elements, if necessary. Plastic mounts are less expensive and of lighter weight. If the barrel is made of engineering plastic, it is produced by a highly efficient and precise method of injection molding. The interior surfaces of the barrel are also coated to protect them and to prevent internal reflection and flare.

Assembling the lens

  • 4 Other parts of the lens, such as the diaphragm and auto focus module, are produced as subassemblies. The iris diaphragm is constructed of curved leaves cut out of thin sheets of metal. The metal leaves are held in place by two plates. One plate is fixed, the other moves, and has slots for sliding pins. These slide the leaves back toward the barrel to open the diaphragm or into the center to close the opening as the f-stop ring is turned. The diaphragm assembly is fastened into place when the lens mount is attached to the end of the barrel. The auto focus is also added, the optical elements are positioned, and the lens is sealed. After final assembly, the lens is adjusted and inspected rigorously. It must meet the design standards for optical resolution, mechanical function, and auto focus response. Lenses may also be tested by subjecting them to shocks, dropping, and vibration.

Quality Control

Approaches to lens manufacture vary greatly among companies. Some use full automation including industrial robot s to make their products, others use large assembly lines, and still others pride themselves on hand-crafting. Quality and precision are essential to lens production, however, regardless of manufacturing approach. Incoming materials and components are rigorously inspected for quality and compliance with engineering specifications. Automated processes are also inspected constantly and subjected to tolerance checks. Hand-craftsmanship is performed only by skilled artisans with long years of training. Quality control and stress tests are incorporated in each manufacturing step, and elements and components are measured with precise instruments. Some measuring devices are laser-controlled and can detect deviations of less than 0.0001-millimeter in a lens surface or in lens centering.

The Future

Camera lenses are enjoying new developments in many areas. The consumer's interest in the best photos for the lowest cost has led to disposable cameras with simple but effective lenses. Lenses for professional photographers and for specialized uses such as high-performance binoculars or telescopes are made with exotic and "non-preferred" glasses that are more sensitive, expensive, and harder to obtain than traditional materials. These are called "abnormal dispersion" materials because they merge all the colors in the light passing through the lens to produce the best images, rather than allowing colors to disperse like a simple lens. Water and other liquids also bend light, and scientists have identified liquids that are abnormally dispersive and can be trapped between layers of ordinary glass to produce the same image quality as exotic optical glass. The ordinary or "preferred" glass (preferred because of low cost and workability) is bonded around the liquid with flexible silicone adhesive. The resulting "liquid lens" may replace several elements in a professional-quality lens. It also reduces the coating required and the amount of lens polishing needed because the liquid fills imperfections in the glass. The cost of the lens is reduced, and the light transmission properties are improved. Lens makers in the U.S., Japan, and Europe are preparing to produce liquid lenses in the near future.

Where To Learn More

Books

Bailey, Adrian and Adrian Holloway. The Book Of Color Photography. Alfred A. Knopf, 1979.

Collins, Douglas. The Story of Kodak. Harry N. Abrams, Inc., Publishers, 1990.

Sussman, Aaron. The Amateur Photographer's Handbook. Thomas Y. Crowell Company, 1973.

Periodicals

Coy, Peter, ed. "A Clear-Eyed View from Liquid Camera Lenses." Business Week, January 17, 1994, p. 81.

From Glass Plates to Digital Images. Eastman Kodak Company, 1994.

"Photographic Lenses." Photographic, April 1991, pp. 56-57.

"Liquid Lens." Popular Science, May 1994, p. 36.

Gillian S. Holmes

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Camera

Camera

Background

Photography has staked its claim as America's favorite hobby, and today, cameras are available in sizes and shapes to suit the needs of every kind of photographer and budget. Much like Henry Ford wanted a Model T in every driveway, George Eastman thought every consumer should be able to afford a camera. His developments in photographic film and portable, affordable cameras led to photo negatives from which prints can be made, color film, color positives or slides, pocket-sized cameras, and point-and-shoot cameras (including single-use or disposable cameras) known for their ease of operation. Photography has also branched into more complex directions with developments in the camera lens, the single-lens reflex (SLR) camera that allows the photographer to see through the viewfinder what the camera sees, state-of-the-art electronics, and an assortment of mechanical controls.

From the simplest amateur camera to the most complex, professional piece of equipment, all cameras have five common parts. The lens is made of glass or plastic (or groups of glass elements) and focuses light passing through it on the film to reproduce an image. The diaphragm is an opening or aperture that controls the amount of light entering the camera from the lens and so limits the film's exposure to light. The diaphragm ranges in complexity from a fixed lens, opening in a simple camera, to apertures that can be adjusted manually or automatically.

The three remaining parts common to all cameras are incorporated in the camera body (also called a chassis or housing). The shutter also limits the film's exposure to light by controlling the length of time the film is exposed. Shutter speed can be adjusted in many cameras to suit light conditions and the photographic subject matter; moving objects can be frozen on film with fast shutter speeds. The camera body encloses and protects the operating parts of the camera, including a light meter, the film transport system, built-in flash, the reflex viewing system, and electronic and mechanical components. The body must be lightproof, durable, and resistant to environmental changes. The viewfinder is a specialized lens the photographer uses to preview the photograph either through the lens, if the camera is a reflex-type, or in a separate view for simpler cameras.

History

The story of the camera may have begun thousands of years ago when people first noticed that a chink in a wall or hole in a tent let light into the room and made a colored, upside-down reflection. The word camera means room, and the first camera was a room (or tent, actually) called a camera obscura with an eye at the top of the tent much like a periscope that could be rotated. Artists used it by training the eye on an image, which was reflected down onto the artist's work table where it could be drawn. Euclid and Aristotle studied the principles of light, and Leonardo da Vinci described and diagrammed the camera obscura, although it was not his discovery.

The first portable cameras were boxes with lenses on the front over apertures and plates at the back. The plates were flat and covered with light-sensitive materials. By removing the cover over the lens, light entered the box and was focused by the lens on the rear plate. Early exposures took from several seconds to a number of minutes because the sensitivity of the plates was so poor. Also, the only image was the one on the plate; photos, like those produced by Louis Daguerre and Joseph Niepce in France during the 1820s and 1830s, were unique artworks that were not reproducible. Plate-type photography continued to be refined, and, as plates were made more sensitive to light, the lens was improved to provide a variable aperture to control light exposure. The camera was also modified by adding a shutter, so exposure time could be limited to seconds or less. The shutter was made of several metal leaves that opened or closed completely. A rubber bulb was used to provide air pressure to operate the shutter.

The invention of roll film in 1889 by George Eastman made photography more portable because cameras (and their operators) did not need to carry cumbersome plates and chemicals. Eastman's invention and the cameras he also manufactured made photography a popular hobby. By 1896, the Eastman Kodak Company had sold 100,000 cameras. The camera was modified to include a film transport system with take-up spools, a winder, a lever for cocking the shutter, and shutter blinds. By the turn of the century, the major obstacles to taking photographs had been eliminated and, in the twentieth century, photographic history has branched from the basic concept and perfected each development. These developments are numerous, but include design and perfection of flash units including synchronized and high-speed flash; continued miniaturization of cameras; the Polaroid system of producing a finished print in the camera and without a negative; design of high quality equipment like Leica, Zeiss, and Hasselblad cameras and lenses; and advocacy of photography as an art form by photographers such as Matthew B. Brady, Alfred Stieglitz, Edward J. Steichen, and Ansel Adams.

George Eastman introduced his Kodak™ camera in 1888 and revolutionized popular photography. The Kodak camera was small, handheld, inexpensive, and, for the first time, made especially to hold a roll of flexible film. Prior to this, light sensitive chemicals captured the black-andwhite negative images on pieces of glass. Large cameras were used to hold the photographic plates and a tripod was needed for support. For ordinary Americans, photography consisted of posed portraits in a professional photographer's studio. The Kodak camera allowed the average person to take photographs of their families, their homes, and their surroundings. It inaugurated the snapshot era of do-it-yourself photography. Awarded a medal at the Photographers' Annual Convention as the photographic invention of 1888, thousands of $25.00 Kodak cameras sold during the first year.

By 1889, celluloid, a type of plastic, replaced the paper of the first flexible film base. Another unique feature for the time was that the amateur photographer returned the unopened camera to the Rochester, New York, factory. There the film negatives were processed and the 2.5 in (6.35 cm) circular images were printed on paper and mounted on cardboard. The camera was then re-loaded with an unexposed roll of flexible film and returned to the customer with the processed photographs and negatives. This cost $10.00 and produced 100 snapshots. This activity became so popular that the term kodaking soon meant a fun outing to take snapshots.

Cynthia Read-Miller

Design

Camera design is an intricate and specialized field. All designs begin with conceptualizing a product and evaluating the potential market and the needs of the consumer for the proposed product. Designs begin at computer-aided design (CAD) work stations, where the product's configuration and workings are drawn. The designer selects the materials, mechanics, electronics, and other features of design and construction, including interfaces with lenses, flash units, and other accessories.

The computer design is also tested by computer simulation. Designs that pass the computer program's review are checked against the initial concept and marketing and performance goals. The camera may then be approved for production as a prototype. Manufacture of a prototype is needed to test actual performance and to prepare for mass production. The prototype is tested by a rigorous series of field and laboratory tests. Prototypes selected for manufacture are used by the engineers to prepare design details, specifications, and toolmaking and manufacturing processes. Many of these are adapted directly from the CAD designs by computer-aided manufacturing (CAM) systems. Additional design is needed for any systems or accessories that interface with the new product. Camera manufacturers can conceive a new product and have it ready for shipment in approximately a year by using CAD/CAM design methods.

The Manufacturing
Process

Camera chassis and cover

  • 1 The camera chassis or body and back cover are made of a polycarbonate compound, containing 10-20% glass fiber. This material is very durable, lightweight, and shock-resistant as well as tolerant to humidity and temperature changes. Its major disadvantage is that it is not resistant to chemicals. The polycarbonate is molded to very specific tolerances because the internal workings of the camera must fit precisely to work well and to use the strength of the chassis for protection against jarring and other shocks, to which mechanical and electronic parts are sensitive. After the chassis is molded and assembled, it becomes the frame to which other parts of the camera, like electrical connections in the battery housing and the auto focus module, are attached.

Shutter and film transport system

  • 2 The shutter assembly and film transport system are manufactured on a separate assembly line. These parts are largely mechanical although the film transport system has electronics to read the speed of the film. DX film coding appears as silver bands on the roll of film, and these are detected by multiple contacts in the film chamber. More advanced cameras have microchips that see the data imprinted in the silver bands and adjust shutter speed, flash, and other camera actions. Again, all parts are precisely made; the film magazine size must be accurate to 60 thousandths of an inch.
  • 3 The shutter functions like a curtain that opens and closes. It must operate exactly to expose the film for the correct length of time and to coordinate with other operations such as the flash. The shutter is made of different materials depending on the type of camera and manufacturer.

Viewfinder lens

  • 4 The viewfinder lens is a specialized lens that is manufactured using the same methods as a camera lens. The viewfinder also is made of optical glass, plastic, or glass/plastic combinations. All but the simplest viewfinders contain reticles that illuminate a frame and other information on the eyelens to help the photographer frame the picture. An in-line mirror has specialized coatings for color splitting; as many as 17 coatings may be added to the mirror to correct and modify its reflective properties.

    Single-lens reflex (SLR) cameras have through-the-lens viewing capabilities and are also called real image viewfinders because they let the photographer see as the lens sees. The SLR viewfinder uses a prism to bend the light from the lens to the photographer's eye, and the prism is made of optical glass to precise requirements to make the correct view possible.

LCD screen and electronics

  • 5 Advanced cameras and most compact models include a liquid crystal display (LCD) screen that provides information to the photographer such as film speed, aperture, photographic mode (including landscape, portrait, close-up, and other modes), count of photos taken, operation of redeye and flash and other accessories, battery condition, and other data regarding the camera's workings. Integrated circuitry is constructed as subassemblies for the electronic brains of the camera and attached flash, if any.

Quality Control

Quality assurance and quality control practices are a matter of course among camera manufacturers. All departments from manufacturing to shipping have their own quality assurance procedures, and companywide quality assurance is also overseen by a separate division or department. The overseeing quality assurance divisions use statistical methods to monitor aspects of product quality such as camera function, performance, consistency, and precision. They also guide the flow of one assembly system into another and provide corrective measures if problems arise.

Byproducts/Waste

No byproducts result from camera manufacture, but a number of wastes are produced. The wastes include resins, oils such as cutting oil, solvents used for cleaning parts, and metals including iron, aluminum, and brass. The metals and resins are remainders or cuttings from manufactured parts and powder-fine cuttings and dust. The wastes are sorted by type and recovered; they are recycled or treated as industrial wastes by firms specializing in these activities. Camera manufacturers are well aware of the hazards associated with their processes and are careful to observe environmental regulations and sensitivities both in the country of manufacture and in receiving marketplaces. Japan's camera industry stopped using chlorofluorocarbons and trichloroethanes to clean printed circuit boards and camera lenses in 1993 on instruction of Japan's Ministry of International Trade and Industry (MITI), in response to import conditions of other countries, and in acknowledgment of industry-wide respect of the environment.

The Future

For cameras like many other technical products, the future is electronic. The digital still camera introduced in 1995 stores approximately 100 pictures electronically. Instead of a viewfinder or eyepiece, the camera has a color LCD screen similar to the view-type screen on some video cameras, so photos can be viewed instantly. It can be connected by cables to a computer, television, or VCR, so pictures can be transferred to screen, tape, or digitized electronically. The digital camera has another advantage; after taking a photo and reviewing it, the photo can be erased if the photographer does not like the result. There is no wasted film or wasted space in the digital storage process. Also, the photograph can be edited, cropped, or enlarged as it is being taken. After photos have been taken, they remain in the camera as digital files rather than as negatives. To take more photos, these images have to be removed, and they can be stored on a computer disk. All the photos can be moved as a batch, or they can be stored on the computer one-by-one, or deleted from both the camera and computer storage. The transfer process requires software that also allows text to be attached to each picture to date it or write a caption. The camera or computer containing the photos can be hooked up to a video printer to print out copies on paper, or the photos can be transferred to videotape for viewing.

Where to Learn More

Books

Bailey, Adrian, and Adrian Holloway. The Book Of Color Photography. Alfred A. Knopf, 1979.

Collins, Douglas. The Story of Kodak. Harry N. Abrams, Inc., 1990.

Sussman, Aaron. The Amateur Photographer's Handbook. Thomas Y. Crowell Company, 1973.

Periodicals

Antonoff, Michael. "Digital Snapshots from my Vacation." Popular Science, June 1995, pp. 72-76.

From Glass Plates to Digital Images, Eastman Kodak Company, 1994.

GillianS.Holmes

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Cameras

Cameras

JUDSON KNIGHT

Cameras have a number of applications in the world of security and espionage. Cameras can be used for conducting surveillance, for instance, an activity that may require neither proximity to the subject nor even a human operator. More intriguing and wide-ranging, however, are the uses of the camera in up-close work by intelligence operatives. Such situations require human ingenuity, not only for designing effective photographic equipment, but also for concealing the camera and its operations. Intelligence personnel have used cameras to photograph individuals and their activities, as well as buildings and installations. A significant subcategory of espionage photography involves the copying of documents, often with special cameras, although sometimes with ordinary equipment.

Background

A camera functions by focusing light through a lens onto a surface coated with light-sensitive chemicals. The concept of the camera dates back to the Renaissance idea of

the camera obscura, a small, dark chamber into which light was permitted only through pinholes. During the early nineteenth century, inventors perfected the camera obscura to make the prototype of the modern camera, but early photography was a cumbersome affair characterized by large, boxy cameras and slow exposures. It is for this reason that most photographs from the American Civil Warthe first conflict chronicled in depth by photojournaliststend to be stills rather than action shots.

Only in the twentieth century was it possible to build cameras useful for work in espionage. Particularly after World War II, the number of possible camera types suited either to speed, concealment, range, or photographic resolution proliferated along with the many uses to which espionage and security organizations applied them. Today, the principal uses for cameras in the security and espionage context are copying documents, capturing activities of individuals at a close range, or conducting surveillance on large groups over large areas from a distance.

The last of these activities, while certainly a significant part of espionage and security operations, typically lacks the tactile qualities popularly associated with the use of cameras by spies. Surveillance aircraft such as the U2 and SR71 Blackbird, as well as satellites of the KH or "keyhole" series, carried sophisticated cameras for longrange photography of missile installations, weapons factories, and other facilities. In such a situation, the human operator of the camera plays a lesser role than the technology behind its operation, and that of the craft that keeps it aloft many thousands of feet or miles above Earth's surface.

Surveillance cameras in daily life. Similarly, with closerange surveillance and security cameras that operate automatically, the human operator is of little significance. Still, there is a great deal of immediacy and intimate contact between camera and subjectespecially because the unwitting subject seldom knows the degree to which he or she is under surveillance. In modern times, Americans have become accustomed to ordinary security cameras in stores and other businesses, particularly those whose contents have high monetary value. According to the Security Industry Association, by 2003, there were some two-million closed-circuit television systems in operation, most of them operated by private businesses for security purposes, in the United States. CCS International, a security company, estimated that the average person in Manhattan was photographed 73 to 75 times a day. Often this happened when the individual was not aware of the surveillance, even when the camera itself was in plain view. That camera might well be a dummy, with the real camera photographing an individual's activities from another angle.

Although civil libertarians protested this proliferation of security cameras, they are unlikely to disappear any time soon. J. P. Freeman, a firm that performs marketing research for the security industry, estimated in 2002 that the market for digital video surveillance equipment was growing at the rate of fifteen percent per year, particularly noticeable gains during the early twenty-first century recession. Additionally, in the heightened climate of awareness that followed the terrorist attacks of September 11, 2001, Americans were less likely than ever to react to potential violations of privacy.

In communist Eastern Europe. If surveillance cameras are ubiquitous in a democratic nation such as the United States, they are pervasive in closed societiesassuming that the nation possesses the financial means to watch its citizens with electronic eyes. Certainly this was true in East Germany, by far the most prosperous nation in the history of communism, where per-capita incomes in the 1980s ran higher than those of non-communist Greece. The East German Stasi (short for das Ministerium für Staatssicherheit or Ministry of State Security) frequently monitored patrons of public lodgings through the use of a Czech-made surveillance camera with a German T1340 lens. Made to fit into a special cylinder built into the hotel wall, the camera could be operated using a remote shutter release. This piece of equipment, used to spy on hotel patrons, was a variety of the German robot camera developed prior to World War II.

Surveillance Cameras in Espionage

First used by the Nazis in 1934, the robot could snap multiple exposures without requiring manual winding. Originally used by the German air force to rapidly photograph the destruction of targets, it later became a favorite of Nazi intelligence services. The designs of the Nazi era culminated in the Star 50, which could snap 50 exposures in rapid succession. After the war, intelligence agents on either side of the Iron Curtain used robot cameras.

Made to be concealed and, if necessary, operated from a remote location, the robot was ideal for surveillance. Specific varieties of Star 50 were designed to be hidden in handbags, while the robot Star II was flat enough to fit in a special belt concealed by a trench coat. A false coat button covered the camera lens, and the manufacturers provided an entire matching set of buttons so that the user could replace those already on the trench coat if they did not match the false one. The robot Star II could also fit neatly into a briefcase.

The Soviet KGB developed their own variation on the robot, the F21, in 1948. Smallabout the size of a hotel soap barand quiet, the F21 was ideal for concealment. At various times, Soviet designers adapted the F21 to hide it in belt buckles, jackets, umbrellas, and even camera cases. In the latter instance, the spy, posing as a tourist, would carry the camera case open and slung around the neck. The visible camera was a dummy; mounted on the side of the case was an F21 that took pictures at a 90-degree angle to the lens of the dummy camera.

Some other significant surveillance models in the history of Cold War espionage include the British Mark 3 automatic camera. Developed in the 1950s and still in use during the 1990s, the Mark 3 had a chamber so large it could hold enough film for 250 35mm exposures. Sometimes intelligence operatives needed moving pictures rather than stills, and for this, KGB relied on a movie version of the F21, developed in the 1960s. The camera was made to be hidden in a coat, using the false button technique applied with the robot camera.

Copy cameras. To copy documents, intelligence services required special cameras. An ordinary camera could theoretically be used, but would have difficulty in obtaining readable images. A much better option is to use a camera and accessories specially made for that purpose. A camera made specifically for copying documents has a high degree of photographic resolution, and is constructed in such a way as to be operated with a remote shutter release in order to avoid shaking the camera. Usually, the equipment would also include a stand of some kind that would both keep the camera steady and hold it fixed in place some distance from the documents being copied. Finally, because copying by an intelligence agent would most likely be a clandestine activity, it would be necessary to house all this equipment in a package that could easily be concealed.

One camera that fit the bill handsomely was built for the StB, the intelligence service of communist Czechoslovakia. Made to fit into an unobtrusive-looking wooden box, the kit included a Meopta copy camera, lights, a power plug, and a four-legged stand. The camera sat atop the stand, pointed downward. By pressing a button on a shutter release cable, the operator could photograph documents, which were illuminated by light bulbs fitted into housings at the base of the stand.

Both American and Soviet intelligence services used kits that resembled miniature copier machines. The American model was made to fit into an attaché case, while the Soviets' Yelka C64 copy camera had the appearance of a thick book and, therefore, was unlikely to raise immediate suspicions.

Particularly ingenious was the Soviet rollover camera, disguised as a notebook. The undercover agent would regularly carry a real notebook to work, and use it often. Then, when it came time to make copies of documents, the agent would bring the rollover camera notebook, which was identical in appearance to the real notebook. In order to photograph a document, the agent would run the spine of the notebook carefully back and forth across the documents to be copied. Inside the spine were wheels that activated the camera, which was hidden, along with a battery-powered light source, inside the notebook.

Working without a copy camera. Perhaps the greatest resourcefulness of all was required for those situations in which the agent had no special equipment other than an ordinary camera. Victor Ostrovsky, of Israel's Mossad, developed a method for copying that used only a standard camera with a shutter release, a few thick books, and a couple of lamps. The document would be taped to the front a book, which would be set standing on end, facing the camera. The latter would be placed atop one or more books lying flat, and fixed in place with an ordinary adhesive, such as chewing gum. On either side, desk lamps would provide concentrated lighting.

Another setup could be used when the agent needed to copy large amounts of documents, but could use only a camera and standard office equipment. Books would be stacked in two towers of equal heightperhaps 18 inches or sowith enough space between them to lay a document flat. Bridging the tops of the "towers" would be two parallel rulers, spaced almost the width of an ordinary 35mm camera. The camera would be taped to the rulers, and lamps placed on either side of the document. Then, documents could be run through one after the other, and a high volume of information recorded in a short time.

FURTHER READING:

Babington-Smith, Constance. Evidence in Camera: The Story of Photographic Intelligence in World War II. Newton Abbott, England: David and Charles, 1974.

Melton, H. Keith. The Ultimate Spy Book. New York: DK Publishing, 1996.

Murphy, Dean E. "As Security Cameras Sprout, Someone's Always Watching." New York Times (September 29, 2002).

Siljander, Raymond P. Applied Surveillance Photography. Springfield, IL: Thomas, 1975.

SEE ALSO

Cameras, Miniature
Photo Alteration
Photographic Resolution
Privacy: Legal and Ethical Issues

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Cameras

Cameras

A classical image of a crime or accident investigation involves an investigator photographing the scene. Cameras are vital to forensic science , providing a visual record of the scene. For example, a picture of a blood spatter can be used to help determine the cause of the spill long after the stain itself has been cleaned away.

A visual image is an ideal way to preserve a record of a scene before items are disturbed. Pictures are admissible as legal evidence , providing the prosecution or jury members with an evocative image of the scene. Visual images can aid in reaching a verdict on a crime.

A traditional camera functions by focusing light through a lens onto a surface coated with light-sensitive chemicals. Digital cameras have internal processors that record images in an electronic form, converting wave-like analog information into digital information represented by bits. The concept of the camera dates back to the Renaissance idea of the camera obscura, a small, dark chamber into which light was permitted only through pinholes. During the early nineteenth century, inventors perfected the camera obscura to make the prototype of the modern camera, but early photography was a cumbersome affair characterized by large, boxy cameras and slow exposures.

Surveillance cameras, which have long been an espionage tool, can also be a useful forensic tool. According to the Security Industry Association, by 2003 there were some two million closed-circuit television systems in operation, most of them operated by private businesses for security purposes, in the United States. Many households are also equipped with surveillance cameras.

A forensic investigator can gain legal access to the recordings made by a security camera. This can provide vital information of events before, during, and following the crime or accident.

Increasingly, municipalities are installing surveillance cameras at traffic intersections to monitor the license plate numbers of traffic violators. Such data can be useful forensically.

Virtually all traditional cameras have at least one glass lens, and one with a zoom or telephoto lens typically has three: front and rear convex lenses, with a concave one in between. Though zoom lenses clearly have an application in the world of law enforcement, they can also provide long-distance photos that are useful in a forensic investigation. Miniature and subminiature cameras are usually for photographing images at close range. Typically they would have only a single lens, perhaps with a coating to reduce reflections or glare.

In place of lenses, a pinhole camera uses tiny apertures, or openings, so small that they are known as pinholes. The value of a lens lies in its ability to focus and thus photograph distant objects or ones close by, depending on the settings. By contrast, the value of a pinhole camera is precisely the fact that it does not have lenses, and therefore can produce images of distant and nearby images equally well.

Forensic photography is typically the responsibility of a skilled photographer. The photographer will be careful to photograph the subject from a variety of angles and to use lighting conditions that will emphasize all the detail of the object.

Digital cameras can be useful, since the digitized information can be downloaded to a database for further scrutiny. But, even traditional film photographs can be digitized for electronic storage and analyses.

see also Crime scene investigation; Evidence.

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Cameras

Cameras

INDUSTRIAL CODES

NAICS: 33-3315 Photographic and Photocopying Equipment Manufacturing

SIC: 3861 Photographic Equipment and Supplies

NAICS-Based Product Codes: 33-331511, 33-331512, 33-331513, 33-331514, 33-331515, and 33-3315Y

PRODUCT OVERVIEW

If we view photography as the recording of images, the camera is the device that collects and focuses light from a target and film is the medium that does the recording. Such, at any rate, was the natural division of functions until about the mid-1990s when digital photography spread from industrial and space applications to the public in general. After that time, two technologies for capturing light have been in competition: film and magnetic media. We get printed photographs from either source. Terminology also changed in the 1990s. The traditional camera loaded with film has come to be known as the analog and its new competitor as the digital camera. Analog cameras have a venerable history going back to the nineteenth century. They existed long before that time as well, thus before the development of image-storage chemistry, as curiosities and as devices used by artists. Analogs exhibit levels of sophistication not yet matched by digital devices, but the general trend in the industry suggests that digital machines will ultimately replace the analog camera except in special uses.

The basic elements of the camera are lenses that collect light through an aperture, a viewing mechanism that shows the user what the picture will look like, storage space for film, a mechanism for placing frames of film behind the lens one by one, and a mechanism to expose the film to light for a brief moment. Modern cameras do much more. They have motors to advance and to rewind the film, flash lights, and automatic focus and light control using optical sensors, computer chips, and mechanics. Cameras count the pictures taken and display the tally. They may be equipped so lenses can be exchanged; alternatively they will have a zooming lens. Finally, they have battery power to drive the mechanisms. Digital cameras use electronic means to translate light into digital signals; the digitized data are stored in built-in computer memory. Once memory is full, cameras have disks to store pictures. Disks may be offloaded to other computers. Digital devices do not need film or means of moving it through the camera.

There are four major types of camera named for the method by which the photographer previews the picture to be taken. Viewfinder cameras provide a special window arranged so that it more or less matches what the lens sees. The match is never perfect because the angle of view is different. This difference is the parallax error; the picture in the viewer and the print from the lens will be slightly different. Most amateur photographers are little bothered by the error, but it matters to professionals. Single Lens Reflex (SLR) cameras are the most popular. They show exactly what the lens sees, the image transferred from lens to user by a series of mirrors. The first mirror, placed at an angle in front of the film, is snapped aside when the camera is clicked. Twin Lens Reflex (TLR) cameras have two lenses; one takes the picture; another, above it, displays the same image to the photographer. The view is larger and sharper, but with two lenses used, a parallax error is still present. View cameras let the user see exactly what the lens is looking at, but no mirrors are involved. The view screen is placed directly behind the lens where the film is normally waiting. In view cameras the film is held elsewhere. When the picture is snapped, the film is first moved into place in front of the view screen for the exposure.

The image reaching the film or the electronic sensor from the lens is upside down and inverted from side to side (left is right and right is left). The last two types of cameras show the photographer this upside down view. In the SLR mirrors are so arranged that they put the picture the right way around again. In viewfinder cameras the view port is just an aperture; the user's eye is just looking at the scene.

Camera lenses come in standard, wide angle, and telephoto varieties. Focal length measured in millimeters is used to define these categories. Focal length is the distance from the center of the lens to the surface of the film or chip that will record the image. Standard lenses most closely match what human eyes see and are around 50 mm wide, ideal for 35 mm film. Wide angle lenses are less than 50 mm and are best for landscape work or wide pictures of a large family gathered for its picture in the backyard at reunion time. Telephoto lenses come in medium and long versions, the medium being 85 to 135 mm, very good for portrait photography. Long telephoto lenses are greater than 135 mm and are used in sports photography and taking pictures on safari to capture elusive or dangerous animals. These types of lenses are known as fixed focal view or as prime lenses. Zoom lenses are designed so that the focal length can be changed by the user without changing lenses. In handheld cameras the focal length of zooms will range from 35 to 100 mm. Zoom cameras are a compromise. A good intermediate solution is to use an SLR on which different lenses can be mounted as the situation requires it.

Digital cameras are defined by resolution, thus the number of dots or pixels the receiving sensor can support. A minimal resolution is 320 × 400 (128,00 pixels). Photo quality begins at 800 × 600 (480,000 pixels). A high-end resolution is 4064 × 2704 (11 million pixels). The more pixels the sharper the image—but the greater the memory capacity needed to store an album.

Historical Snapshot

The Chinese philosopher Mo-Ti, living in the fifth century B.C., first recorded a curious phenomenon. A tiny hole in the wall of a darkened space will produce an image of the outside on a wall—but upside down. Why? Light beams travel in a straight line. Assume that the tiny hole is in the door of an empty but darkened chamber. Light from the highest point outside, the sky, for instance, will enter the hole at a downward angle, reaching the bottom of the opposing wall. Light from the lowest areas outside will angle up and reach the wall inside near the ceiling. Light from the right will end up on the left, light from the left on the right. Today we know that precisely the same thing happens when light enters ours eyes. What we see is upside down and the sides are reversed, but the brain conveniently switches things back the way they ought to be. People observed this phenomenon throughout time here and there. The Muslim sage Abu Ali Al-Haytham, working in the eleventh century in Egypt, laid the foundations of the science of optics. His extensive experiments involved, among others, working in a dark room with light. His major work, Book of Optics reached an awakened European public in Latin translation at the time of the Renaissance. The phrase "dark room" translated to Latin is camera obscura. Of that phrase today one word remains in common use, the camera. The idea of these projected images through tiny holes, be the chambers that hold them room-sized or just boxes, immediately fascinated people, and the fascination has not died. Leonardo da Vinci included a design for a camera obscura in his notes. Such objects were made for public entertainment and used by artists to project images that they traced on paper. All manner of small, portable cameras of this type were produced. Photography emerged when chemical means were found to capture the images.

Chemical pioneers were Joseph Nicéphore Niépce and Louis Daguerre in France. Niépce produced the first image on a pewter plate in 1826 using bitumen of Judea as his emulsion, an asphaltic substance that hardens under light. Daguerre made the first daguerreotype in 1839, a photograph on copper that had been treated with silver, which darkens with light. Chemistry based on the characteristics of silver came into general use thereafter. Negatives were made on coated glass, first by a very laborious process known as wet plate photography requiring the photographer to prepare the plate, expose it, develop it, and print it immediately on paper that, in turn, he first had to coat with an emulsion. George Eastman in upstate New York founded what later became known as Eastman Kodak by simplifying the wet process. He developed coated glass plates that could be stored before use and after exposure to be developed at the photographer's convenience. Dry plate came on the market in 1879. Eastman is also credited with the development of roll film when he substituted a cellulose substrate for glass in 1889. Equally momentous was Eastman's introduction of the low-cost Kodak camera for the masses. He named it that because he liked the sound of the letter K—and wanted a word that started with and ended in the same letter.

The basic chemistry underlying photography exploits a characteristic of silver-halides, a group of compounds of silver with bromine, iodine, and chloride. Silver-halides are distributed evenly on film. Light causes chemical bonds to break so that metallic silver remains; it darkens the negative. Silver-halides on photographic paper turn the paper black when touched by light. Developing either film or prints requires removing silver-halides that did not react with light. This description neglects the chemical complexities involved in film and paper preparation, developing, and fixing. Complexities are even greater where color is involved. Color requires layered emulsions for three primary colors and more complex chemistry yet. Early pioneers abandoned solid surfaces like Daguerre's copper in favor of translucent plates like glass because they wished to print the actual picture, not its mirror image. Thus negatives came into use as an intermediate transfer mechanisms. The developed negative is turned around so that its bottom becomes its top. Then it is turned front to back so that the side-to-side inversion is corrected. Everything restored to normal, it is then time to print on paper.

The evolution of the camera itself, the hardware as opposed to the wetware of chemistry, involved development of lenses, making the camera itself as compact as possible and eventually portable, adding view ports on the outside and mechanisms for film advance on the inside, adding artificial lighting by means of flash guns and then flash bulbs, and, finally, automating the functions of focusing by range finders and lighting by aperture and shutter control. Development of the modern camera took place predominantly in Europe, the United States, and in Japan. France had pioneered the category; Germany became dominant in camera development by, for instance, introducing the first SLR (the Ihagee Exacta), the first 35mm film and camera (Leitz's famous Leica) and the first TLR (the Rolleiflex by Rollei Gmbh). Eastman Kodak was a major factor across the board in introducing and developing mass-produced cameras and successive innovations in film, including color film. General Electric introduced the first flashbulb. Fuji and Nikon (Nippon Kogaku) were early participants in the field, Fuji predominantly in film, Nikon in cameras. Nikon, which originated as an optical firm, supplied the lenses for the first Canon cameras.

Digital Cameras

Digital cameras, a revolutionary departure from film-based devices, originated in 1969 with the development of a new integrated circuit technology at Bell Labs called CCD, abbreviating charge coupled device. CCDs can be built up into sensor arrays in which a single CCD can record the charge produced by light hitting one spot or pixel of a surface. The intensity of the charge will correspond to a color, a value that can be recorded in computer memory as a number. The tiny size of CCDs means that very high resolution sensors are possible. Earliest uses of CCDs were in video recording and in digitizing photographic images by NASA for transmittal from the moon and from satellites to earth in digital formats. Texas Instruments developed a digital camera but did not commercialize it. The first effective digital camera aimed at the professional market was introduced in the United States by Kodak in 1991, the DCS-100. The first consumer cameras appeared in the mid-1990s introduced by Kodak, Casio, Ricoh, Sony, and others. Another sensor technology is CMOS, the acronym for "complementary metal oxide semiconductor." The advantages of CMOS include lower power consumption hence longer battery life. Sensors are cheaper to manufacture and thus bring costs down. Their pixel density is lower, however, and they pick up less light. Both technologies are evolving rapidly, both have supporters. More brands use CCD than CMOS technology as we come to the close of the first decade of the twenty-first century.

MARKET

Three approaches to sizing a market are to look at domestic shipments as reported by the U.S. Bureau of the Census, to calculate apparent consumption, and to obtain market research data at the retail level. The first approach is meaningful if the United States is a major producer. Examination of shipments then will show the product's contribution to the economy and job creation. The second approach is useful when substantial portions of the product made here are exported or, similarly, significant percentages of demand are satisfied by imports. The look at retail sales usually demands reviewing data collected by private research organizations. The Census Bureau's retail reporting is never detailed enough to capture the sales of a narrow product category like cameras. In this look at the market we will briefly examine results from all three methods by way of tracking the major transformation in the industry that has taken place in the first decade of the twenty-first century.

Domestic Production

From the viewpoint of national accounting, cameras are part of Photographic and Photocopying Equipment (NAICS 33-3315). Within that industry they are grouped as one category under Still Picture Photographic Equipment. Figure 39 provides the big picture (the entire industry as defined by the NAICS code 33-3315) for the period 1997 to 2005, the most recent available at time of writing. It shows an industry with shipments that were $8.4 billion in 1997, peaked at $8.8 billion in 1998, dropped precipitously from that peak to a low of $1.96 billion in 2002, and have been growing very slowly since that time to reach $2.3 billion in 2005, having shrunk to just over a quarter of the industry's size in 1997.

Details beneath this major category are available, but only for two years: 1997 and 2002. The still picture equipment segment represented 11.9 percent of the industry in 1997 and 34.2 percent in 2002, meaning that other categories bore the brunt of the decline. Between those years the total industry shrank at an annual rate of 25.3 percent but the still picture category at the much more modest rate of 3.6 percent. These years saw the meltdown of the photocopying, microfilming, and motion picture equipment segments. Photocopiers and motion picture equipment went digital, domestic production was replaced by Asian manufacturing. Microfilming suffered from a similar transit from film to digital archiving. Still photography was the hold-out. Still cameras, a subsegment of the still picture equipment category, did even better, as shown by Figure 39.

Camera shipments actually advanced at an annual rate of 19.6 percent from $167 million in 1997 to $408 million in 2002. This healthy growth in the category was directly attributable to domestic production of digital cameras. The total market represented by this volume of shipments, however, is quite small when compared to other sources of data used to size the U.S. market as a whole.

Apparent Consumption

Somewhat marginal data are available on imports and exports from the International Trade Center (ITC), an organization jointly supported by the UN Conference on Trade & Development (UNC-TAD) and the World Trade Organization (WTO). The data are marginal because ITC only reports on photo-graphic equipment, thus at a level roughly corresponding to NAICS 33-3315. Using such data, it would appear that apparent consumption in 2002 was made up of domestic production of $1.96 billion less exports of $1.2 billion plus imports of $3.3 billion, netting out to apparent consumption at the production/wholesale level of $4.1 billion. Imports, thus, accounted for 81 percent of total demand given the high levels of exports ITC reports. Corresponding values for 2005 suggest apparent consumption of $3.7 billion, a decline from 2002. Imports as a percent of demand also declined to 69 percent. Given that this was a period of economic growth, if not exactly at rousing levels, the data are puzzling until we recognize the fact that the costs of digital equipment have been dropping, certainly in the digicam category but in other branches of the industry as well. As we shall see, unit sales have been growing very rapidly. Foreign trade statistics have very low resolution, reminding one of faces fuzzed out on the screen to protect the innocent. They serve merely to indicate that exports represent high proportions of domestic demand.

Retail Estimates

Data of this type are collected by the Photomarketing Association International (PMA) and The NDP Group, to name two prominent market research firms. PMA reported unit shipments of digital cameras of 4.5 million in 2000, 7.0 million in 2001, 9.4 million in 2002, 13.0 million in 2003, 18.2 million in 2004, and 20.5 million in 2005. These data were published in Market Share Reporter 2007. NDP's estimates of unit shipments for 2005 were higher, 27 million, but the estimates made later. That company also put 2006 shipments at 29.5 million units. The PMA series indicates a growth rate from 2000 to 2005 of 35 percent per year. Very dramatic rates of growth are reported by all observers—matched by falling-off-the-cliff style declines in traditional analog cameras and film.

Dollar estimates are also made but are typically tightly held and made available by their producers to subscribers only. Data occasionally surface to view. NDP published estimates for 2005 and projections for 2006 in March 2006. According to NDP the market for digital cameras in 2005 was around $6.2 billion at retail. Point-and-shoot cameras with an average sales price of $199 represented 95 percent of units and 74 percent of dollar sales; more expensive digital SLRs costing on average $1,352 were 5 percent of units and 26 percent of dollars. NDP projected units growing by nearly 18 percent to 2006, revenue dollars 8 percent. Prices of both the low and high end cameras were projected to decrease.

In a report on the first quarter of 2007, PMA data showed that most rapid growth in unit sales was taking place in the high segments. PMA rates its segments by picture density, thus megapixels (millions of pixels, mpx). Greatest change in unit sales was in the 7 and greater mpx cameras, 235 percent. Next were 6-6.9 mpx cameras, 162 percent, and third the low end of the resolution categories, below 3 mpx, growing at 20 percent in the first quarter of 2007. All other segments showed declines. These data, for unit sales, were paralleled by dollar sales with one exception: 7+ mpx machines showed growth of 101 percent in dollars, 6-6.9 mpx machines growth of 66 percent, but the below 3 mpx units showed a decline in dollar sales of 27 percent. Prices were dropping over year-before prices but dropping the most in the low-end category. These patterns, although a snapshot in time only, reflect a wide spread conviction in the industry that buyers tend to cluster in two groups, those who just want to snap a picture at a decent cost and the knowledgeable aficionados who will spend time at the shop, know all about the products, and don't mind spending serious money.

Worth noting in this look at digital cameras are data also reported by PMA showing unit sale declines of 45 percent and dollar sale declines of 50 percent for the analog camera segment—and similar but somewhat lower drops of 21 percent (units) and 20 percent (dollars) for one-time-use cameras, thus the throwaways. Also worth noting was that one category within the analog cluster resisted the general erosion. This category, Advanced Photographic Systems (APS), declined in units sold but showed a 167 percent growth in dollar shipments. Photography was going digital as the first decade of the 2000s was closing but the highest end of analog photography looked like a survivor.

KEY PRODUCERS/MANUFACTURERS

The universe of cameras is dominated by Japanese and German companies with significant roles played by Eastman Kodak in the United States, Samsung in South Korea, and well-known brands coming from Sweden and Switzerland as well.

The list of Japanese participants reads like a recital of electronics giants. Participants in alphabetical order are Canon, Casio, Fuji, Kyocera, Minolta, Nikon, Olympus, Panasonic (which is Matsushita), Pentax, Ricoh, Sanyo, Sharp, Sigma, Sony, and Toshiba. Observers of the field pick either Canon or Sony as the top camera producer worldwide. Canon, which entered the Chinese market and gained penetration toward the end of the first decade of the twenty-first century, is probably the leader by a small margin. Based on estimates by International Data Corporation Canon had top ranking in the U.S. market with a 17.1 percent share in 2004 followed by Sony with 16.7 percent.

German companies are best known for high end products serving the professional photographer or expert amateur. Like their Japanese counterparts, they have also entered the digital camera markets. Producers are Leica, Linhof, Minox, Rollei, and Zeiss AG. Minox is famed for producing very small cameras; until the early 2000s it was a division of Leica but regained its independent status in 2001. Zeiss is a leading global producer of lenses with operations in Germany as well as in Japan. It has its own camera brand, the Zeiss Ikon, but its chief business is manufacturing lenses for others. Among Zeiss's customers are Sony, Nikon, and Nokia in Japan, the last predominantly active in making telephones and therefore not listed above; other Zeiss customers are Rollei in Germany, Sinar in Switzerland, and Hasselblad in Sweden.

Eastman Kodak is ranked third in the United States with a market share of 11.8 percent. The company had sales in 2006 of $13.3 billion. Of this total the company's Consumer Digital Imaging Group earned $2.9 billon. The segment includes cameras, equipment sold to retailers for photo print production, photo printers, and the sale of CMOS imaging sensors to others.

Two Swiss companies participate in the market with well-known brands, Alpa of Switzerland and Sinar AG. Hasselblad is a Swedish firm with world-wide operations. A very small part of Samsung, the global electronics giant based in South Korea, is a line of digital cameras.

MATERIALS & SUPPLY CHAIN LOGISTICS

Camera production is more closely associated with technological expertise than raw materials used in the camera's manufacturing. Although any stable, translucent substance can be fashioned into lenses, glass is used exclusively for at least the outermost lens of cameras because glass resists scratching. All lenses used in high-end cameras are glass; cheaper cameras may use plastic lenses inside. Sand suitable for making glass must be high in silica content and low in iron, chromium, and cobalt; these latter color the glass, but clear glass is desired. Such sands are not uniformly available but common enough all over the world. The high value of lenses versus the raw material from which they are made means that lens manufacturing need not be located where the sand occurs. Flat glass producers, however, dealing in mass products, tend to locate where the sand is. Film used in cameras is now predominantly polyester-based (polyethylene terephtalate), thus a plastic, and widely available. Camera housings are made of plastics and metals; mechanical components are precision-fabricated metal. With digital sensors replacing film, semiconductors are becoming an important component of cost. These products are also high in value and low in weight; they do not influence location.

Cameras have always been high-tech products—even before that phrase emerged with electronics. Camera production has therefore tended to be concentrated where expertise resided, thus in technologically advanced areas like Europe, Japan, and the United States. Most producers in the latter years of the first decade of the 2000s were Japanese because Japan had become the predominant electronics producer in the world.

DISTRIBUTION CHANNEL

Producers use wholesale merchants to supply retailers; retailers sell to the consumer. Based on data provided by Manufacturing and Distribution USA, the wholesale business, including cameras, auxiliary equipment, and supplies was projected to be a $20.3 billion market in the United States in 2007, down somewhat from a $21.0 billion level in 2002, the decline most likely due to eroding film sales. Retailers divide into two major categories. The smaller of these, representing roughly 30 percent of total volume, are specialized camera stores typically serving the high end of the market. Sales of this sector were projected to be $2.98 billion in 2007, down from $3.1 billion in 2002—the shift downward attributable more to declining camera prices than loss of film sales in that camera stores are not major factors in film sales; drug stores are. Most cameras reach the ultimate consumer through department stores, mass merchandisers, and drug stores (low end and one-time-use cameras). Online sales are also a growing factor. Web sites provide means of displaying hundreds of different models—and, indeed, there are hundreds—with full information about features, thus enabling the shopper to engage in extensive and painless comparison-shopping at leisure from the home computer.

Camera stores attract the serious amateur photographer and the professional. Such retailers typically concentrate on a selection of brands only, provide expert in-store staff, and carry substantial inventories of auxiliary products. They also offer repair services on site or act as intermediaries to get damaged cameras repaired by the producer.

KEY USERS

It is axiomatic in the industry to say that key users come in two varieties, the casual user interested only in point-and-click and the serious user. The second category is divided into amateurs and professionals. Sales patterns tend to bear this out. Thus market reports tend to segment the industry into low-end and high-end with the middle barely mentioned in summary reporting. Product sales also cluster in the same manner. Product offerings by producers, however, suggest that demand exists for cameras across a wide spectrum of quality/performance and that the low-high division is more of a convenience than a fact. Otherwise, to take digital cameras as an example, no cameras in the middle range—greater than 3 and less than 7 megapixels—would be on offer.

One-time-use (OTU) cameras are purchased for occasions, thus a single outing or a vacation. Most households own low-end cameras for occasional picture taking. This base of customers supports the industry by buying the most product. The amateur—perhaps best defined as the person who becomes interested in photography as such, not just the product of it—begins above this level and may be divided into at least two segments. Beginners, typically young, will buy the best camera they can afford, thus the upper range of the low end. As they grow older they upgrade the equipment and purchase products in the midrange of performance. A subset of these amateurs graduates into serious photography, typically because individual skills are recognized by family members and friends or personal fascination and discrimination grow. As such amateurs get the means, they become buyers of high-end equipment. If they continue to participate, they enter the upper ranks of photographers.

At the highest end specialization begins to create markets for different kinds of cameras, thus, for instance, those ideal for high speed action, portraiture, landscape, nature photography, and other contexts. The distinctions between amateurs and professionals begin to blur when their skills converge.

ADJACENT MARKETS

Camera sales support a range of adjacent markets. Most prominent of these, but declining, is the market for film, photographic paper, and photo-developing services. This market is largely being displaced by others, including photo printers based on inkjet or laser printer technologies, toner and ink cartridges, and special paper. The services sector for digital image printing remains. Photomarketing Association International, for instance, reported that in 2006, 49 percent of digital prints were produced at home (or in the office on borrowed equipment), 42 percent were made by retail outlets, and 9 percent were ordered using online services. In the latter case, disks are shipped to a processor, or digital files are sent electronically, and prints are returned by mail.

Serious photographers are buyers of extra lenses, light sensors, tripods, and other auxiliary products. Projectors and screens for showing 35mm slides were a large market. Projectors are still used to show digital photographs in business presentations using computers and PowerPoint software. In the home new television sets based on plasma and liquid crystal display (LCD) technology are replacing screens, with the TV set's hardware readily putting photos from a disk up on the screen. Camera cases, picture frames, and photo albums are yet other adjacent markets ultimately created by the presence of the camera.

RESEARCH & DEVELOPMENT

Research and development in this industry has come to be focused powerfully on the rapidly growing digital sensor technology. CCD and CMOS technologies would both benefit from further miniaturization in order to lift possible picture resolutions. Broad trends in the semiconductor field promise yet tinier devices.

Transistors (switches) are now 65 nanometers (nm, for billionth of a meter) in size for the highest end computers. By 2008, 45nm transistors were in the offing and, beyond that, 32nm and 22nm transistors were envisioned by leading companies, including Intel, Advanced Micro Devices (AMD), Toshiba, and NEC Corporation. Sensor pixel densities set ultimate limits to the sharpness of images available in digital cameras. CCD technology is limited by energy demand and thus battery life. The most effective batteries, lithium ion, are plagued by over-heating problems; they sometimes cause fires. CMOS technology crowds circuits onto the surface of the sensor itself. This circuitry, while cooler, interferes with the reception of light. Tinier circuits would improve the ability of CMOS sensors to receive more light and thus sharpen the images they produce.

In that both CCD and CMOS technologies are relatively new, very significant improvements, including new kinds of sensors, are likely to emerge in the 2010s and beyond. Worth noting is that improvements will follow R&D trends in semiconductors rather than leading them.

CURRENT TRENDS

The trend in the camera industry is the digital revolution. It has yet to run its course, but all indicators suggest that other than in professional applications, film cameras will disappear from the market. At the end of the first decade of the twenty-first century prices of digital cameras were still falling, but industry observers were projecting a leveling off by 2010. The digital camera has stimulated transformations in the processing of images to paper.

Film processors have lost roughly half their old market for photo development and, with the rapid growth in photo printing, may lose more of this business yet. Color printing generally had, as of the middle of the first decade of the 2000s, just begun to nibble at the monochrome printer market, but color machines were growing and black-and-white versions were declining in share.

TARGET MARKETS & SEGMENTATION

To some extent markets and segmentation have been outlined under the Key Users heading. Market segments in the industry are usually rendered as disposable cameras aimed at special occasions, point-and-shoot cameras targeted at the casual user emphasizing ease of use and modest cost, mid-level cameras with higher resolution aimed at knowledgeable amateurs with marketing messages based on features and costs, and high end products sold for performance and further subdivided by end-use categories. At the highest end lens quality and the reputation of the producer are the chief selling features.

RELATED ASSOCIATIONS & ORGANIZATIONS

Consumer Electronics Association, http://www.ce.org

Business Technology Association, http://www.bta.org/i4a/pages/Index.cfm?pageID=2031

Electronic Industries Alliance, http://www.eia.org

National Electrical Manufacturers Association, http://www.nema.org

Photomarketing Association International, http://www.pmai.org/index.cfm/ci_id/1198/la_id/1.htm

Professional Photographers of America, http://www.ppa.com/splash.cfm

BIBLIOGRAPHY

Bellis, Mary. "The History of the Digital Camera." About.com. Available from 〈http://inventors.about.com/library/inventors/bldigitalcamera.htm〉.

Burns, Paul. "The History of the Discovery of Cinematography." October 1999. Available from 〈http://www.precinemahistory.net/index.html〉.

Darnay, Arsen J. and Joyce P. Simkin. Manufacturing & Distribution USA 4th ed. Thomson Gale, 2006, Volume 2, 1088-1092.

"The First Photograph." Harry Ransom Center, The University of Texas at Austin. Available from 〈http://www.hrc.utexas.edu/exhibitions/permanent/wfp/〉.

Lazich, Robert S. Market Share Reporter 2007. Thomson Gale, 2007, Volume 2, 532-537.

"The NDP Group Focuses on Digital Camera Forecast Through 2010." Press Release, The NDP Group, Inc. 6 March 2006. Available from 〈http://www.npd.com/press/releases/press_060306.htm〉.

"PMA Monthly Printing and Camera Trends Report." Press Release, Photomarketing Association International. 7 June 2007. Available from 〈http://www.pmai.org〉.

Spehr, Paul. "Why Nitrate?" Conservation OnLine. 7 August 2003. Available from 〈http://palimpsest.stanford.edu/byform/mailing-lists/amia-l/2001/01/msg00018.html〉.

Steffens, Bradley. Ibn al-Haytham: First Scientist. Morgan Reynolds Publishing. 2006.

Wilgus, Beverly and Jack Wilgus. "The Magic Mirror of Life: An Appreciation of the Camera Obscura." Available from 〈http://brightbytes.com/cosite/what.html〉.

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