High speed wide angle zoom lens system

Details High speed wide angle zoom lens system High speed wide angle zoom lens system

1997-03-13

1998-09-08

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514, G02B 1318

Patent

active

058053514

ABSTRACT:
A large aperture wide angle zoom lens system including four groups of lenses. The four lens groups, viewed from the object side, include a first group with negative refractive power, a second group with positive refractive power, a third group with negative refractive power, and a fourth group with positive refractive power. The zoom lens system is capable of maintaining the position of the image constant during zooming, has fine imaging performance despite a large zoom ratio of 2.times. and a speed which is as fast as F/2.8 with an angle of view of 84.degree. on the wide side.

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