Fast aspherical lens system

Details Fast aspherical lens system Fast aspherical lens system

1994-06-16

1996-04-30

Epps, Georgia Y.

Optical: systems and elements

Lens

Reverse telephoto

359708, 359754, G02B 1304

Patent

active

055130453

ABSTRACT:
A fast aspherical lens system is provided which includes a front lens group having a negative power, a diaphragm, and a rear lens group having a positive power, arranged in this order from the side of an object to be photographed. The rear lens group is provided with at least one lens having a diverging aspherical surface and satisfies the following conditions:

REFERENCES:
patent: 3738738 (1973-06-01), Takahashi
patent: 3870402 (1975-03-01), Takahashi et al.
patent: 3975091 (1976-08-01), Takahashi
patent: 4487485 (1984-12-01), Hisada
patent: 4566764 (1986-01-01), Matsuo
patent: 5162945 (1992-11-01), Matsuo et al.
patent: 5189558 (1993-02-01), Ishii et al.

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