Zoom lens

Details Zoom lens Zoom lens

1999-08-20

2000-09-26

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

061249831

ABSTRACT:
A compact zoom lens having only four lens groups is provided which changes power by shifting a second lens group from the object side along the optical axis, and stabilizes the image plane position by shifting a fourth lens group from the object side along the optical axis. By satisfying three prescribed conditions, magnification of the image is prevented from decreasing for objects at very near distances, and aberrations are favorably corrected so as to provide for high quality imaging over the entire range of zoom for all object distances. At least one lens element has an aspherical surface.

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