Retro-focus type wide angle lens system

Details Retro-focus type wide angle lens system Retro-focus type wide angle lens system

1974-01-25

1976-08-10

Corbin, John K.

350215, G02B 962, G02B 964

Patent

active

039738329

ABSTRACT:
A retro-focus type wide angle lens system comprises a negative first component located on the object side and including at least one negative meniscus lens; a positive intermediate second component consisting of one or two lens groups including at least one biconvex lens group and a rear third component which includes of four consecutive lenses including, in order, a positive meniscus first lens having a rear convex surface, a biconcave second lens, a positive meniscus third lens having a rear convex surface and a fourth positive lens; whereby the back focus of the total lens system is longer than the focal length, and satisfying the following conditions:

REFERENCES:
patent: 3583791 (1971-06-01), Mori
patent: 3635546 (1972-01-01), Mori
patent: 3740120 (1973-06-01), Ruhl
patent: 3862794 (1975-01-01), Fuji

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