Zoom lens system

Details Zoom lens system Zoom lens system

1977-05-06

1979-03-06

Clark, Conrad J.

G02B 1514

Patent

active

041427793

ABSTRACT:
A zoom lens system wherein the front lens group comprises, in order, a positive lens, a high power negative meniscus lens, a negative lens, and a high power positive lens. The relatively movable rear lens group comprises a plurality of lenses in front of and behind a double concave lens, including a double convex lens on the object side and at least two convex lenses on the image side. The various lens system parameters, including the minimum focal distance, the spacing between the front and rear lens groups, the maximum angle of incidence, the overall length of the system, the amount of back-focus zoom variation, and the magnification variation ratio, are selected to satisfy six different limiting conditions which balance an optimum miniaturization with a satisfactory aberration level.

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