Nikon Corporation

Mami Muratani

Haruo Sato

Kouichi Ohshita

Akihiko Obama

Issei Tanaka

Satoshi Miwa

Daisaku Arai

Taku Matsuo

Motohisa Mouri

Yoko Komatsubara

Fumiaki Ohtake

Sayako Yamamoto

Akino Kondo

A variable magnification optical system having a front lens group and a rear lens group arranged in order from the object side along an optical axis, the rear lens group comprising a first focusing lens group and a second focusing lens group. When the magnification is changed, the spacing between lens groups adjacent to each other changes, at the time of changing from focusing on an object at infinity to focusing on an object at a short distance, the position of the front lens group is fixed, the first and second focusing lens groups move to the image surface side along different trajectories, and the conditional expression 0.05<(−fF2)/ft<0.50 is satisfied, where fF2 is the focal length of the second focusing lens group, and ft is the focal length of the variable magnification optical system in a telephoto end state.

Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

A variable magnification optical system (ZL) comprises a front group (GA) and a rear group (GB). The rear group (GB) has a first focusing lens group (GF1) and a second focusing lens group (GF2). From focusing on an object at infinity to focusing on a short-distance object, the front group (GA) is fixed with respect to an image surface, and the first focusing lens group (GF1) and the second focusing lens group (GF2) move on different trajectories along an optical axis. The variable magnification system satisfies the following conditional expressions.0.25<β11<2.000.25<β22<2.00

An optical system used in an optical apparatus, such as a camera, is configured to include a plurality of lens groups such that at focusing the distances between the lens groups are varied, that a final lens group disposed closest to an image side of the lens groups includes at least one lens surface having a pole, and that all of the following conditional expressions are satisfied:0.020<<0.120  (1)0.010<<0.150  (2)where Y is image height, f is the focal length of the optical system, TL is the total optical length of the optical system, and Bf is the back focus of the optical system.

Optical system, optical apparatus, and method for manufacturing optical system

An optical system comprises, in order from an object side, a front group GF having positive refractive power, an aperture stop S and a rear group GR. The front group FR comprises a front focusing group GFF having positive refractive power, and the rear group GR comprises a rear focusing group GRF having positive refractive power, upon focusing the front focusing group GFF and the rear focusing group GRF being moved toward the object side, and a predetermined condition being satisfied. Thus, an optical system having a superb optical performance, an optical equipment equipped therewith and a manufacturing method for the optical system are provided.

Optical system, optical equipment, and manufacturing method for optical system

An imaging lens SL mounted in a digital single lens reflex camerais composed of, in order from an object side, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third lens group Ghaving positive refractive power, wherein upon focusing on a near-distance object point from an infinite-distance object point, at least one of the first lens group Gand the second lens group Gis moved so as to change a distance between the first lens group Gand the second lens group Gand the imaging lens satisfies a given conditional expression, thereby providing a downsized imaging lens suited to an imaging apparatus such as a single lens reflex camera, having a less of change in overall length and optimal to driving an intra-lens-barrel motor.

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

A zoom lens system ZL mounted in an electronic still cameraetc is constructed to include, in order from an object side, a first lens group Ghaving negative refractive power and a second lens group Ghaving positive refractive power, in which the second lens group Ghas two cemented lenses. A distance between the first lens group Gand the second lens group Gchanges when a lens position state changes from a wide-angle end state to a telephoto end state, thereby providing the zoom lens system exhibiting preferable optical performance, an optical apparatus including the zoom lens system and a magnification varying method using the zoom lens system.

Zoom lens system, optical apparatus equipped with zoom lens system and method for zooming zoom lens system

An optical system includes, in order from an object side: a first lens group Ghaving negative refractive power; and a second lens group Ghaving positive refractive power; upon zooming from a wide-angle end state W to a telephoto end state T, a distance between the first lens group Gand the second lens group Gvarying, and the second lens group Gmoving, and the second lens group Gincluding a focusing lens group Gf that carries out focusing from an infinity object to a close object, and a decentering lens group Gs that is movable in a direction having a component perpendicular to an optical axis, thereby providing an optical system capable of establishing both of internal focusing and a decentering lens group with obtaining compactness and excellent optical performance, an optical apparatus equipped with the optical system, and a method for manufacturing the optical system.

An imaging lens SL mounted in a single lens reflex digital camerais composed of, in order from an object side, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third lens group Ghaving negative refractive power. Upon focusing on a near-distance object from an infinitely distant object, a configuration is that at least any one of the first lens group Gand the second lens group Gis moved to the object side to vary a distance between the first lens group Gand the second lens group G. Accordingly, a downsized imaging lens having a small moving amount upon shooting a close range object, in which various aberrations are well corrected is provided.

Imaging lens, optical apparatus equipped with imaging lens and method for manufacturing imaging lens

A zoom lens system ZL installed in an electronic still cameraand the like comprising, in order from an object side: a first lens group Ghaving negative refractive power; and a second lens group Ghaving positive refractive power; the second lens group including at least two cemented lenses each of which includes a positive lens disposed to the object side and a negative lens disposed to an image side, a distance between the first lens group and the second lens group varying upon zooming from a wide-angle end state to a telephoto end state, thereby providing a zoom lens system having excellent optical performance, an optical apparatus equipped with the zoom lens system, and a method for manufacturing the zoom lens system.

Zoom lens system, optical apparatus equipped therewith, and method for zooming zoom lens system

Providing a zoom lens system with a vibration reduction function excellently correcting aberrations with accomplishing compact, lightweight, and slim upon being accommodated, and to provide an optical apparatus using the zoom lens system. The system consists of, in order from an object, a first group having negative power, a second group having positive power. Upon zooming from a wide-angle end to a telephoto end, a distance between the first group and the second group decreases. The first group consists of, in order from the object, a first lens having negative power and a second lens having positive power. The second group consists of, in order from the object, a third lens having positive power, a fourth lens having negative power, and a fifth lens having positive power. An image blur is corrected by shifting the second group as a whole in a direction substantially perpendicular to the optical axis.

Zoom lens system and optical apparatus using the same

In a zoom lens ZLhaving a plurality of lens groups Gto Gwhich are disposed in order from an object, where a refractive index average value of the lens components which constitute the zoom lens ZLis defined as ndav and a refractive index average value of the lens components which constitute the first lens group Gwhich is disposed to closest to the object among the plurality of lens groups Gto Gis defined as ndGlav, the zoom lens ZLis constituted to satisfy the conditional expression ndav&#x2267;1.80 and to satisfy the conditional expression ndGlav&#x2267;1.85.

Zoom lens, optical apparatus, and method for forming an image of an object

A zoom lens ZL installed in an electronic still cameraincludes, in order from an object side, a first lens group Ghaving negative refractive power, and a second lens group Ghaving positive refractive power. A distance between the first lens group Gand the second lens group Gvaries upon zooming from a wide-angle end state to a telephoto end state. The second lens group Ghas a front lens group GF and a rear lens group GR, and the front lens group GF is moved along the optical axis upon focusing on a close object, thereby providing a compact zoom lens having excellent optical performance, an optical apparatus equipped with the zoom lens, and a method for manufacturing the zoom lens.

Zoom lens, optical apparatus equipped therewith and method for manufacturing the zoom lens

The object is to provide an optical system with a wavelength selecting device. According to one aspect of the present invention, an optical system with a wavelength selecting device includes, in order from an object along an optical axis, an objective optical system composed of optical elements having refractive power and an aperture stop, a no-power optical group composed of optical elements having no refractive power, and an imaging device. The no-power optical group includes the wavelength selecting device for making short wavelength light be selectively substantially non-transparent. The wavelength selecting device preferably satisfies the predetermined conditional expressions.

Optical system with wavelength selecting device

Providing a zoom lens system excellently correcting various aberrations with accomplishing to be compact, lightweight, and slim upon being accommodated, and to provide an optical apparatus using the zoom lens system. The system consists of, in order from an object, a first group Ghaving negative power, a second group Ghaving positive power. Upon zooming from a wide-angle end W to a telephoto end T, a distance between the first group Gand the second group Gdecreases. The first group Gconsists of, in order from the object, a first lens Lhaving negative power and a second lens Lhaving positive power. The second group Gconsists of, in order from the object, a third lens Lhaving positive power, a fourth lens Lhaving negative power, and a fifth lens Lhaving positive power. Given conditions are satisfied.

Providing a zoom lens system having excellently correcting various aberrations with accomplishing to be compact, lightweight, and slim upon being retracted. The system is composed of, in order from an object, a first group having negative refractive power, and a second group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first group and the second group varies. The first group is composed of two lens elements which are, in order from the object, a negative lens having a concave surface facing an image, and a positive lens. The second group consists of three lens elements or less and includes, in order from the object, a positive lens, an aperture stop for defining an f-number, and a negative lens component including a negative lens and disposed to the image side of the aperture stop. Given conditions are satisfied.

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Tokyo, Japan

Mami Muratani