Large-aperture-ratio internal focusing telephoto lens

Details Large-aperture-ratio internal focusing telephoto lens Large-aperture-ratio internal focusing telephoto lens

2005-05-03

2008-08-12

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

Telephoto

C359S785000, C359S786000, C359S787000

Reexamination Certificate

active

07411745

ABSTRACT:
The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1having positive refractive power, a second lens group G2having negative refractive power, and a third lens group G3having positive refractive power. The second lens group G2is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.

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