Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

1980-02-27

1982-04-06

Evans, F. L.

G02B 1514

Patent

active

043233023

ABSTRACT:
A wide-angle zoom lens system comprising a front lens group consisting of a first negative meniscus lens component, a second negative lens component and a third positive lens component, and a rear lens group consisting of a fourth positive lens component, a fifth positive meniscus lens component, a sixth negative lens component and a seventh positive lens component. Said zoom lens system is so adapted as to permit changing focal length of the entire lens system as a whole by varying the airspace reserved between said front and rear lens groups, and has a wide field angle of 73.4.degree. at the wide position, a high zoom ratio of 1.62 and an aperture ratio of F/3.2 assuring brightness sufficient for practical use.

REFERENCES:
patent: 4074931 (1978-02-01), Okudaira

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