Zoom lens

Details Zoom lens Zoom lens

1989-08-01

1991-04-23

Arnold, Bruce Y.

G02B 1514

Patent

active

050094920

ABSTRACT:
A zoom lens comprising: a first, when counted from an object side hereinafter, lens group having a positive refractive power; a second lens group having a positive refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power, whereby variation of magnification is performed by moving the second lens group and the fourth lens group, and focusing is performed by moving the fourth lens group, the lens group satisfying the following conditional expressions provided that a focal length of the fourth lens group is f4, a focal length of the entire lens system at a wide-angle end is f.omega., a zoom ratio is z, and an imaging magnification at a telephoto end of the second lens group is .beta.2T: ##EQU1##

REFERENCES:
patent: 4802747 (1989-02-01), Horiuchi
patent: 4818083 (1989-04-01), Mihara
patent: 4844602 (1989-07-01), Kitagishi et al.

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