Afocal front attachment for zoom objective

Details Afocal front attachment for zoom objective Afocal front attachment for zoom objective

1976-08-10

1978-06-13

Sacher, Paul A.

G02B 1510

Patent

active

040945871

ABSTRACT:
A substantially afocal front attachment of variable magnification ratio, to be combined with a fixed-focus rear lens group in order to form a zoom objective, consists of two fixedly interconnected outer lens members and an axially shiftable biconvex intermediate lens member. The two outer lens members are negative menisci turning their convex sides toward the intermediate lens member. The objective has a varifocal ratio close to 2:1.

REFERENCES:
patent: 3466113 (1969-09-01), Bentele

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