Telephoto lenses. (varieties and how they are used for single lens reflex cameras)

PSA Journal | August 1, 1994| | Copyright

Telephoto lenses are used to obtain an image size larger than would be possible using a shorter lens at the same subject distance. Telephoto lenses have a fixed focal length as opposed to the variable focal length of zoom lenses. They have much less complex construction and if only one focal length is considered, a telephoto is much less expensive and has a larger maximum aperture than a zoom lens providing the same focal length. Some telephotos have focal lengths greater than even the longest zoom lens.

The special design of the telephoto produces a lens with the ...

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