Photographic lens with perspective-adjustment feature

Details Photographic lens with perspective-adjustment feature Photographic lens with perspective-adjustment feature

1977-03-10

1978-03-28

Griffin, Donald A.

350247, 354 38, G03B 506, G02B 702, G03B 708

Patent

active

040818128

ABSTRACT:
The invention provides a perspective-correction lens with an automatic-diaphragm feature which permits through-the-lens viewing at full brilliance, while also permitting the diaphragm to be set in accordance with photo-electric exposure measurements performed at the body of the camera to which the lens is mounted. Such automatic-diaphragm operation is correctly performed, regardless of the extent or direction of eccentric-offset adjustment of the lens with respect to the camera axis.

REFERENCES:
patent: 2931268 (1960-04-01), Gelb
patent: 3270640 (1966-09-01), Hofmann et al.
patent: 3623415 (1971-11-01), Atzmuller
patent: 3704658 (1972-12-01), Uesugi
patent: 3713725 (1973-01-01), Uesugi

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