Zoom lens

Details Zoom lens Zoom lens

1994-08-12

1996-06-25

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

055305946

ABSTRACT:
A telephoto zoom lens includes, in the following order from the object side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, and a third lens group having a positive refracting power. Upon zooming from the wide-angle end to the telephoto end, at least the first and third lens groups move in the object direction, the air distance between the first and second groups increases, and the air distance between the second and third lens groups decreases. The telephoto zoom lens satisfies the following conditions:

REFERENCES:
patent: 4840469 (1989-06-01), Moriyama

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