1981-03-11
1982-11-16
Corbin, John K.
G02B 1516
Patent
active
043592708
ABSTRACT:
A high performance zoom lens including, in order from the object side, a convergent first lens group including a cemented lens composed of a negative meniscus lens having a surface of greater curvature on the image side and a first positive meniscus lens having a surface of greater curvature on the object side and a second positive meniscus lens having a surface of greater curvature on the object side, a divergent second lens group including a negative meniscus lens having a surface of greater curvature on the image side, a biconcave lens and a positive meniscus lens having a surface of greater curvature on the object side, a convergent third lens group including a biconvex lens and a convergent fourth lens group including a cemented lens composed of a biconvex lens and a biconcave lens, a cemented lens composed of a negative meniscus lens having a surface of greater curvature on the image side and a biconvex lens, and a negative meniscus lens having a surface of greater curvature on the object side. Each of the lens groups is independently mechanically mounted so as to be movable for zooming.
REFERENCES:
patent: 4105291 (1978-08-01), Tsuji
patent: 4303312 (1981-12-01), Basista
Asahi Kogaku Kogyo Kabushiki Kaisha
Corbin John K.
Sugarman Scott J.
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