Zoom lens system

Details Zoom lens system Zoom lens system

1997-01-23

1999-03-30

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

058896198

ABSTRACT:
There are arranged, in order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, the first and fourth lens groups being fixed whereas the second and third lens groups are moved in the axial direction to effect zooming. Further, the following conditions (1), (2) and (3) are satisfied:

REFERENCES:
patent: 4491395 (1985-01-01), Okudaira
patent: 5221995 (1993-06-01), Yaneyama

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