Inverted telephoto lens

Inverted telephoto lens
A lens construction which gives a short focal length with a long back focus or lens angle lenses to be produced for small format cameras, where space is required for mirrors, shutters, etc.
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Inverted telephoto lens
Lens constructed so that the back focus (distance from rear of lens to film) is greater than the focal length of the lens. This construction allows room for mirror movement when short focus lenses are fitted to SLR cameras.

See also: Lenses, Telephoto lens, Space, Focal, Camera