Optical system, method for focusing, and imaging apparatus...

Details Optical system, method for focusing, and imaging apparatus... Optical system, method for focusing, and imaging apparatus...

2011-04-12

2011-04-12

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S794000

Reexamination Certificate

active

07924511

ABSTRACT:
Providing an optical system having excellent optical performance over entire focusing range from infinity to a close distance, a method for focusing the optical system, and an imaging apparatus equipped therewith. The optical system includes, in order from an object, a first lens group G1having positive refractive power, and a second lens group G2having positive refractive power. The second lens group G2is movable along an optical axis for varying focusing. The first lens group G1satisfies a given conditional expression.

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patent: 3-200909 (1991-09-01), None
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Extended European Search Report and Search Opinion from European Patent Appln. No. 09250517.

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