Zoom lens

Details Zoom lens Zoom lens

1996-10-23

1997-11-25

Sugerman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359676, 359686, 359689, G02B 1514

Patent

active

056918518

ABSTRACT:
A zoom lens is disclosed, comprising a front lens group having a first, a second and a third lens units, totaling at least three lens units, and whose overall refractive power for the wide angle end is positive and a rear lens group having a lens unit of positive refractive power and another lens unit of negative refractive power, wherein when zooming from the wide angle to the telephoto end, the first, the second and the third lens units all axially move in such relation that the overall refractive power of the front lens group is weaker in the telephoto end than in the wide angle end, and the lens units in the rear lens group all axially move in such relation that their separation narrows.

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