Finite distance zoom lens system

Details Finite distance zoom lens system Finite distance zoom lens system

1981-10-21

1984-10-02

Corbin, John K.

G02B 964, G02B 1516

Patent

active

044744366

ABSTRACT:
A finite distance zoom lens system including a first lens group having a negative focal length and a second lens group having a positive focal length. The two lens groups are mechanically movable to thereby vary the focal length while maintaining constant the distance between the object surface and the image surface. The zoom lens system has a magnification of about 1/10 to 1/5 times.

REFERENCES:
patent: 4157212 (1979-06-01), Ogawa

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