Zoom lens capable of accomplishing macro-photography

Details Zoom lens capable of accomplishing macro-photography Zoom lens capable of accomplishing macro-photography

Filed on

1985-06-03

Date issued

1988-09-13

Examiner

Corbin, John K.

Other Related Categories

350427, G02B 1522

Type

Patent

Status

active

Patent number

047705116

Description

ABSTRACT:
A zoom lens has, in succession from the object side, a first lens group of positive refractive power, a second lens group of negative refractive power, a third lens group of positive refractive power and a fourth lens group of positive refractive power. The first lens group, the third lens group and the fourth lens group are movable toward the object side for a magnification change from the wide angle end to the telephoto end. The focusing up to a short distance object is made possible by moving the second lens group along the optic axis from the position of its telephoto end toward the object side and moving the third lens group along the optic axis from the position of its telephoto end. The zoom lens satisfies the following condition:

REFERENCES:
patent: 4492437 (1985-01-01), Masumoto et al.
patent: 4634236 (1987-01-01), Masumoto

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