Zoom lens system

Optical: systems and elements – Lens – With variable magnification

Patent

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Details

359557, 359683, G02B 1514, G02B 2764

Patent

active

057813485

ABSTRACT:
A compact zoom lens system that moves during zooming from a maximum wide-angle state to a maximum telephoto state also can shift an image to compensate for vibrations (shaking). The zoom lens system comprises first through fifth lens groups. During zooming at least the first lens group and the fifth lens group move toward the object side so that a distance between the first lens group and the second lens group increases; a distance between the second lens group and the third lens group decreases; a distance between the third lens group and the fourth lens group increases; and a distance between the fourth lens group and the fifth lens group decreases. At least one of the lens elements that comprise the fourth lens group is a shift lens group that shifts the image by moving in a direction substantially perpendicular to the optical axis. The zoom lens system also satisfies several conditions.

REFERENCES:
patent: 5069537 (1991-12-01), Kitagishi
patent: 5585966 (1996-12-01), Suzuki

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