Zoom lens of short total length

Details Zoom lens of short total length Zoom lens of short total length

1980-12-22

1983-12-13

Corbin, John K.

350423, 350463, 350464, G02B 704

Patent

active

044202261

ABSTRACT:
The disclosed zoom lens includes a first lens group of positive power movable for focusing, a second lens group of negative power movable for varying the focal length of the system, a third lens group of positive power movable for image shift compensation, and a fourth lens group of positive power stationary during focusing and zooming. The fourth lens group consists of front and rear assemblies of which the front comprises, from front to rear, a singlet of positive power convex toward the front and a meniscus doublet of forward convexity with its cemented surface convex toward the front, and the rear comprises a single of positive power and a meniscus doublet of forward concavity, and is characterized by fulfilling the following requirements:

REFERENCES:
patent: Re28591 (1975-11-01), Nakamura
patent: 4145115 (1979-03-01), Betensky
patent: 4307943 (1981-12-01), Betensky et al.

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