Zoom lens

Details Zoom lens Zoom lens

1987-10-09

1989-06-13

Arnold, Bruce Y.

354222, G02B 15177, G02B 964

Patent

active

048386685

ABSTRACT:
A zoom taking lens for a photographic single lens reflex (SLR) camera. The lens has an air space between elements of the lens, which air space is large enough to accommodate reflective means for directing rays which have passed through elements of the lens in front of the reflective means, to viewfinder means. By being able to accommodate the reflective means within the length of the lens and with the reflective means being axially movable the back focal length of the lens may be much smaller than is the case in a conventional SLR camera in which the reflective means is movable into and out of the back focal length between the rearmost element of the lens and the film of the camera.

REFERENCES:
patent: 3273457 (1966-09-01), Macher et al.
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patent: 4185191 (1980-01-01), Stsuffer
patent: 4304466 (1981-12-01), Betensky
patent: 4387967 (1983-06-01), Yamazaki et al.
patent: 4506970 (1985-03-01), Fujibayashi
patent: 4529286 (1985-07-01), Fujii
patent: 4609944 (1986-09-01), Nakada et al.
patent: 4694151 (1987-09-01), Yoshimura

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