Zoom lens

Details Zoom lens Zoom lens

1974-04-19

1976-08-17

Sacher, Paul A.

350176, 350177, 350187, G02B 1518

Patent

active

039750892

ABSTRACT:
A lens having an equivalent focal length variable between predetermined limits where the lower limit is less than the diagonal of the image frame and where the lens comprises four lens groups of positive, negative, negative and positive powers, respectively, and the first three groups mounted from the object end are movable in unequal relationship to vary the focal length while all four groups are axially movable in fixed relation to each other to focus the lens.

REFERENCES:
patent: 3464763 (1969-09-01), Berger
patent: 3533678 (1970-10-01), Altman et al.
patent: 3850507 (1974-11-01), Uesugi

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