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Article: Telephoto lenses. (varieties and how they are used for single lens reflex cameras)
- Article from:
- PSA Journal
- Article date:
- August 1, 1994
- Author:
CopyrightCOPYRIGHT 1994 Photographic Society of America, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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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 rear nodal plane (from which the focal length is determined) located near or in front of the entire ...