Compound zoom lens

Details Compound zoom lens Compound zoom lens

1991-02-19

1992-01-21

Sugarman, Scott J.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359692, 359701, G02B 1508, G02B 1516

Patent

active

050823604

ABSTRACT:
A compound zoom lens optical system includes a variable focal length photographing lens consisting of a first lens group having a positive refracting power, and a second lens group having a negative refracting power from an object side in turn. A conversion lens is separably added to an image side of the variable focal length photographing lens. The conversion lens is simultaneously movable along an optical axis to be interlocked with at least one of the first and second lens groups of the variable focal length photographing lens so as to change a synthesized focal length with said variable focal length photographing lens. The variable focal length photographing lens and the conversion lens satisfy the following conditions:

REFERENCES:
patent: 4015895 (1977-04-01), Hirose
patent: 4146305 (1979-03-01), Tanaka
patent: 4240697 (1980-12-01), Takano
patent: 4318592 (1982-03-01), Tanaka
patent: 4330180 (1982-05-01), Tanaka

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