Zoom lens

Details Zoom lens Zoom lens

1977-03-23

1979-03-20

Clark, Conrad J.

G02B 1518

Patent

active

041451155

ABSTRACT:
A zoom lens having a semi-field angle of between 12.6.degree. and 6.3.degree. capable of focusing at a 1:2 image-to-object distance ratio while providing a comfortable working range. The lens comprises a movable focusing group, a second stationary compensating group, two zooming groups which move axially relative to the lens and differentially of each other, and a fifth rear master group.

REFERENCES:
patent: 3533679 (1970-10-01), Baluteau
patent: 3598476 (1971-08-01), Merigold

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