Bright and compact optical-compensation type zoom lens system

Details Bright and compact optical-compensation type zoom lens system Bright and compact optical-compensation type zoom lens system

1981-02-17

1983-03-22

Corbin, John K.

G02B 1514

Patent

active

043773257

ABSTRACT:
A bright and compact optical-compensation type zoom lens system comprising a first lens group I having positive refractive power, a second lens group II having negative refractive power, a third lens group III having positive refractive power, and a fourth lens group IV having positive refractive power, the zoom lens system being arranged to carry out zooming by keeping the lens groups II and IV fixed and moving the lens groups I and III, the zoom lens system being arranged so that the focal length in the tele-position is long and, moreover, the quality of image is good.

REFERENCES:
patent: 3051052 (1962-08-01), Bergstein
patent: 4232942 (1980-11-01), Ikemori

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