Importance

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Abstract

A step zoom lens includes a first movable lens group of negative power, a diaphragm which is immovable during zooming, and a second lens group of positive power. A fundamental zooming path along which the first lens group is moved to vary a focal length without causing an image shift is defined so that the distance of the first lens group from the diaphragm is reduced and is thereafter increased, upon zooming from a wide angle extremity to a telephoto extremity, and a fundamental zooming path along which the second lens group is moved is defined so that the distance of the second lens group from the diaphragm is linearly varied. The discrete stop positions of the first and second lens groups are determined to be different from a focal length position at which the distance between the first lens group and the diaphragm on the fundamental zooming path thereof is minimum or the vicinity thereof.

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First Claim