Wide angle lens

Details Wide angle lens Wide angle lens

1976-10-01

1978-09-26

Clark, Conrad J.

G02B 1134

Patent

active

041165365

ABSTRACT:
A wide angle lens system of the retrofocus type having a ratio of back focal length to equivalent focal length of greater than two and a large relative aperture. The lens system comprises 13 elements in nine groups including four consecutive doublets and is capable of focusing to an object distance of eleven equivalent focal lengths from the front vertex thereof.

REFERENCES:
patent: 3748021 (1973-07-01), Tajima et al.
patent: 3856386 (1974-12-01), Fujioka
patent: 3966306 (1976-06-01), Okudaira

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