Wide angle photographic lens

Details Wide angle photographic lens Wide angle photographic lens

1975-04-21

1976-08-17

Corbin, John K.

G02B 900

Patent

active

039750914

ABSTRACT:
A wide angle photograhic lens which has the back focal distance of 1.2 to 1.4 times as long as the focal length comprising seven lens components constituted by seven lenses in which the first lens is a positive lens the face of which of greater curvature is on the object side, the second and third lenses are negative meniscus lenses convex to the object side, the fourth lens is a positive lens, the fifth lens is a negative lens, the sixth lens is a positive meniscus lens convex to the image side, and the seventh lens is a positive lens, wherein the following conditions are satisfied: ##EQU1##

REFERENCES:
patent: 3635546 (1972-01-01), Mori
patent: 3844640 (1974-10-01), Nakagawa
patent: 3884556 (1975-05-01), Nakagawa

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