Large aperture wide-angle photographic lens

Details Large aperture wide-angle photographic lens Large aperture wide-angle photographic lens

1977-08-30

1979-03-13

Clark, Conrad J.

G02B 1304

Patent

active

041439449

ABSTRACT:
A large aperture wide-angle photographic lens system is composed of ten lenses grouped in eight lens components. In order from the object side to the image side, the first lens is a positive lens, and the second and third lenses are negative meniscus lenses having their surfaces of higher curvature facing the image side. The fourth and fifth lenses form a cemented doublet, the fourth lens being a positive lens and the fifth lens being a negative lens. The sixth and seventh lenses also form a cemented doublet with the sixth lens and the seventh lens being positive and negative lenses, respectively. Both doublets are cemented at the surfaces of highest curvature. Each of the eight, ninth and tenth lenses are positive lenses.

REFERENCES:
patent: 3512874 (1967-10-01), Woltche
patent: 3992086 (1974-07-01), Yamashita
patent: 3994574 (1975-10-01), Nakagawa

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