Wide angle photographic lens

Details Wide angle photographic lens Wide angle photographic lens

1979-11-15

1982-01-19

Corbin, John K.

350458, 350462, G02B 1304

Patent

active

043113672

ABSTRACT:
A wide angle photographic lens comprises a divergent forward group and a convergent rearward group. The forward group has at least one negative meniscus lens component having its convex surface facing the object side. The rearward group has a diaphragm, at least one positive lens component disposed forwardly of the diaphragm, a biconcave negative lens component disposed rearwardly of the diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member provided most adjacent to the image side. The focusing lens member has at least one lens movable in the direction of the optic axis. The focusing is effected by movement of the movable lens alone.

REFERENCES:
patent: 3870400 (1975-03-01), Yamashita et al.
patent: 3923369 (1975-12-01), Nakamura
patent: 3975090 (1976-08-01), Lawson
patent: 4025170 (1977-05-01), Kawamura
patent: 4029397 (1977-06-01), Yamashita

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