Photographic wide angle lens

Details Photographic wide angle lens Photographic wide angle lens

1991-03-26

1991-11-26

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359740, 359794, G02B 908, G02B 1318

Patent

active

050678035

ABSTRACT:
Described herein is a photographic wide angle lens which is composed of, from the object side thereof, a first lens of positive meniscus having a convex surface on the object side, and a second lens of positive meniscus having a concave surface on the object side, the wide angle lens having an aspheric surface at least on one of the four lens surfaces provided by the first and second lenses to improve astigmatism, spherical aberration and coma. The lens is also arranged to satisfy the condition of 0.85<fF/fR<1.15 (where fF and fR are focal lengths of the first and second lenses, respectively), thereby imparting symmetrical factors to maintain characteristics of the hypergon.

REFERENCES:
patent: 4878745 (1989-11-01), Endo et al.
patent: 4932764 (1990-06-01), Simpson, Jr.
patent: 5000552 (1991-03-01), Simpson, Jr. et al.

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