Special purpose lenses. (using wide-angle photographic lenses with different focal lengths or features that change the size of subject matters)

PSA Journal | June 1, 1994| | Copyright

There are a number of lenses that are somewhat different in design and construction from the standard or normal lenses traditionally listed for and supplied with the 35mm SLR cameras. They are intended to produce special effects such as: including more subject matter - wide angle; making larger images of distant subjects - telephoto; optionally varying image size - zoom; making large images of small objects - macro; enlarging.

With the exception of the latter, most of these lenses link to the automatic exposure control systems within the camera body. Those few which ...

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