Zoom lens, optical apparatus and manufacturing method

Details Zoom lens, optical apparatus and manufacturing method Zoom lens, optical apparatus and manufacturing method

2009-10-02

2010-11-09

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

07830616

ABSTRACT:
A zoom lens comprises, in order from an object, a first lens group G1having negative refractive power, a second lens group G2having positive refractive power, and a third lens group G3having positive refractive power. The first lens group G1consists of one spherical negative lens and one spherical positive lens with an air space therebetween, and the conditional expression 0.50<(DG1+DG2+DG3)/fw<1.75 is satisfied, where DG1to DG3denote the thickness of the first lens group G1to third lens group G3respectively on the optical axis, and fw denotes the focal length of the zoom lens in the wide-angle end state.

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