Zoom lens system

Details Zoom lens system Zoom lens system

2007-01-02

2007-01-02

Schwartz, Jordan (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S686000

Reexamination Certificate

active

11091652

ABSTRACT:
Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a1A lens group G1A having positive refractive power, and a1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the1B lens group G1B to the object.

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