Nikon Corporation

Kabushiki Kaisha Topcon

Mitsuaki Wada

Tadashi Okamoto

Takeyuki Kato

Including, in order from an object side: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power, each distance between respective lens groups varying upon zooming; the third lens group including, in order from the object side, a first sub-group having positive power, a second sub-group having positive power, a third sub-group having negative power, and a fourth sub-group having positive power, the first sub-group being movable along an optical axis for focusing, the third sub-group being movable in a direction including a component perpendicular to the optical axis, thereby correcting an image blur, and a given condition being satisfied, thereby providing a compact zoom lens having high optical performance with disposing a focusing lens and a vibration reduction lens in the same lens group, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens.

Zoom lens, optical apparatus and method for manufacturing zoom lens

Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from &#x3b2;=0 through at least &#x3b2;=&#x2212;0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis.

Close-up lens, imaging apparatus, and method for focusing close-up lens

An imaging lens SL installed into such as an electronic still cameraincludes, in order from an object side: a first lens group Ghaving positive refractive power; a second lens group Ghaving negative refractive power; a third lens group Ghaving positive refractive power; and a fourth lens group Ghaving positive refractive power; the second lens group Gand the third lens group Gmove along an optical axis upon focusing from infinity to a close object, and a given conditional expression is satisfied, thereby providing a fast imaging lens capable of taking a picture from infinity to a close object with high optical performance, an optical apparatus equipped with the imaging lens, and a method for manufacturing the imaging lens.

Imaging lens, imaging apparatus, and method for manufacturing imaging lens

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 Ghaving positive refractive power, a second lens group Ghaving negative refractive power, and a third lens group Ghaving positive refractive power. The second lens group Gis moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group Ghas at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.

Large-aperture-ratio internal focusing telephoto lens

In order to observe a front eye portion of an eye (E) to be examined, when a frame is moved to within a first region to approach the eye E to be examined, a stereo angle converting portion as means for shifting an optical path and a color temperature converting element ( ) as optical converting means are removed from right and left optical axes (L and L ). On the other hand, in order to observe an eye fundus portion of the eye (E) to be examined, when the frame is moved to within a second region to leave the eye (E) to be examined, the stereo angle converting portion and the color temperature converting element ( ) are disposed on the right and left optical axes (L and L ).

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Tokyo, Japan

Mitsuaki Wada