Zoom lens system

Details Zoom lens system Zoom lens system

1992-07-02

1994-10-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514

Patent

active

053531620

ABSTRACT:
A zoom lens system having a zoom ratio of approximately 2 that is used with a compact camera. The system's overall lens length at the telephoto end is shorter than its focal length at the telephoto end, and it experiences small variations in aberrations during zooming. The present zoom lens system comprises, in order from the object side, a positive first lens group and a negative second lens group, which adjust the magnification by varying the distance therebetween. This lens system satisfies the following conditions:

REFERENCES:
patent: 4720179 (1988-01-01), Ito
patent: 4818081 (1989-04-01), Ito
patent: 4911539 (1990-03-01), Tsunashima et al.
patent: 5071235 (1991-12-01), Mori et al.

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