Wide-angle zoom lens system having a high varifocal ratio

Details Wide-angle zoom lens system having a high varifocal ratio Wide-angle zoom lens system having a high varifocal ratio

1993-07-29

1995-05-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514, G02B 1318

Patent

active

054186463

ABSTRACT:
A zoom lens system comprising, in order from the object side, a first lens unit which has a positive refractive power and is kept fixed during zooming, a second lens unit which has a negative refractive power, is movable for zooming and has a vari-focal function, a third lens unit which has a positive refractive power and is movable for zooming, and a fourth lens unit which has a positive refractive power and is movable for zooming; a location of the third lens unit at a tele position of the zoom lens system being on the object side of a location of the third lens unit at a wide position of the zoom lens system. This zoom lens system consists of a small number of lens components, and has a vari-focal ratio of 9 to 12 and a wide field angle of 65.degree. to 68.degree. at the wide position thereof.

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