Wide angle photographic lens

Details Wide angle photographic lens Wide angle photographic lens

1978-09-11

1981-03-24

Corbin, John K.

G02B 960

Patent

active

042576784

ABSTRACT:
An inverted-telephoto lens, particularly of a small size, is disclosed. A negative meniscus lens having a convex surface faces the object. This is followed by a positive lens consisting of a bi-convex lens cemented to a negative lens, a bi-concave lens, a positive meniscus lens having a convex surface directed toward the image and a positive lens having a highly convex lens facing the image. A diaphragm is located between the bi-convex lens and the bi-concave lens. To correct distortion and curvature of field, the negative meniscus lens is highly curved. The spherical aberration, the coma and the halo of the off-axial sagital rays subject to the above correction are corrected by means of the highly positive cemented surface of the positive biconvex cemented lens.

REFERENCES:
patent: 3731989 (1973-05-01), Shimizu
patent: 3936153 (1976-02-01), Ogura
patent: 4130349 (1978-12-01), Hyakumura

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