Large-aperture-ratio internal focusing telephoto lens
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United States of America Patent
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Aug 12, 2008
Grant Date -
Nov 10, 2005
app pub date -
May 3, 2005
filing date -
May 7, 2004
priority date (Note) -
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status (Latency Note)
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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 G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has 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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