Zoom lens

Details Zoom lens Zoom lens

1996-05-31

1999-11-02

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359685, 359686, 359689, 359690, 359691, 359692, G02B 1514

Patent

active

059781505

ABSTRACT:
A high performance zoom lens with a high zoom ratio is suitable for a wide range of uses. The zoom lens includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and the fifth lens group having a positive refractive power. A magnification of the second lens group, a magnification of the third lens group and a magnification of the fourth lens group almost simultaneously attain near equal magnification. The zoom lens system satisfies at least one predetermined condition.

REFERENCES:
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patent: 5388004 (1995-02-01), Adachi
patent: 5440430 (1995-08-01), Sato
Tanaka, Kazuo "Paraxial analysis of mechanically compensated zoom lenses. 3: Five-component type"; Feb. 15, 1983; Applied Optics; vol. 22, No. 4; pp. 541-553.

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