1978-10-17
1979-09-18
Sacher, Paul A.
350176, G02B 1514
Patent
active
041681100
ABSTRACT:
A zoom lens having small distortion including a front lens group having a negative focal length and a rear lens group having a positive focal length, the front and rear lens groups being mechanically movable to vary the overall focal length while maintaining the image position constant.
REFERENCES:
patent: 3848969 (1974-11-01), Tajima
patent: 4074931 (1978-02-01), Okudaira
Asahi Kogaku Kogyo Kabushiki Kaisha
Sacher Paul A.
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