Photographic lens system

Details Photographic lens system Photographic lens system

1992-12-21

1995-03-14

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359715, 359753, 359770, 359782, G02B 1318, G02B 1304, G02B 958, G02B 960

Patent

active

053981367

ABSTRACT:
A single focal length lens system has a first negative lens element and a last negative lens element. The first negative lens element is disposed at an object side end of the lens system and the object side surface thereof is concave. The last negative lens element is disposed at an image side end of the lens system. The lens system fulfills the following condition: ##EQU1## wherein .phi.f represents the refractive power of the first negative lens element; and .phi.1 represents the refractive power of the last negative lens element.

REFERENCES:
patent: 4576448 (1986-03-01), Ikari
patent: 4720183 (1988-01-01), Dilworth
patent: 4936661 (1990-06-01), Betensky
patent: 5002372 (1991-03-01), Tamamura
patent: 5078481 (1992-01-01), Nakayama

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