Zoom lens system

Details Zoom lens system Zoom lens system

1978-07-19

1979-10-30

Sacher, Paul A.

G02B 1518

Patent

active

041726359

ABSTRACT:
A wide angle zoom lens system having a front lens group of a positive refractive power with an extended zoom ratio. A second lens group is located adjacent the first lens group and has sufficient negative refractive power so that the combined refractive power of the first and second lens group is negative. The first and second lens groups are movable as a fixed unit for a zooming operation in a first zoom range defined between the shortest focal length and a medium focal length. These same lens groups are separable for a zooming operation in a second zoom range between the medium focal length and the longest focal length.

REFERENCES:
patent: 3074317 (1963-01-01), Cox et al.

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