Fish eye lens system

Details Fish eye lens system Fish eye lens system

1975-08-20

1977-03-01

Corbin, John K.

350214, G02B 1304

Patent

active

040099431

ABSTRACT:
An extremely wide angle or fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/4 for use with a compact single lens reflex camera. The fish eye lens system includes a first lens group of four lenses on the object side of a diaphragm and a second lens group of at least three lenses on the image side of the diaphragm. From the object to image side, the first lens group includes a pair of negative lenses, a cemented doublet and a positive fourth lens having a convex surface on the image side adjacent a concave surface of the cemented doublet. The second lens group includes a pair of cemented doublets as two of the three lenses.

REFERENCES:
patent: 3589798 (1971-06-01), Ozura
patent: 3741630 (1973-06-01), Nakazawa
patent: 3850509 (1974-11-01), Nakazawa

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