| 摘要 |
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 G 1 having positive refractive power, a second lens group G 2 having negative refractive power, and a third lens group G 3 having positive refractive power. The second lens group G 2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G 1 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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