Compact telephoto zoom lens

Details Compact telephoto zoom lens Compact telephoto zoom lens

1981-03-04

1983-07-26

Corbin, John K.

G02B 1514

Patent

active

043950922

ABSTRACT:
A compact telephoto zoom lens is composed of twelve lenses grouped into nine lens groups. These include, from the object side, a variator system including a first lens group functioning as a focusing group having a positive focal length, a second lens group functioning as a main variator having a negative focal length, a third lens group functioning as a compensator for maintaining an image plane constant which has a positive focal length, and a relay lens system. The first lens group includes a positive meniscus lens convex on the object side and a positive cemented lens composed of a negative meniscus lens convex on the object side and a positive lens. The second lens group includes a negative lens whose lens concave surfaces confront one another and a negative cemented lens composed of a biconcave and a positive lens. The third lens group includes a positive cemented lens composed of a biconvex lens and a negative meniscus lens while the relay lens system includes first and second fourth lens groups.

REFERENCES:
patent: 3000259 (1961-09-01), Turula et al.
patent: 3074317 (1963-01-01), Cox et al.

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