Nikon Corporation

Akihiko Obama

Tomoyuki Sashima

Norikazu Yokoi

Issei Tanaka

Masashi Yamashita

Kensuke Uchida

Motoyuki Ohtake

Hiroshi Yamamoto

Toshinori Take

Taku Matsuo

Satoshi Kazahaya

Kouichi Ohshita

Masahide Tanaka

Takuji Hamasaki

Satoru Shibata

Mami Muratani

Hiroki Harada

Kunihiko Shimizu

Teppei Okuyama

Yuki Kinouchi

Kentaro Terao

Hiroki Ono

Hiroyuki Ishigami

A variable magnification optical system has, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; an aperture stop; a third lens group having positive refractive power; and a rear lens group. Upon zooming from a wide-angle end state to a telephoto end state, at least the rear lens group is moved toward the object side, and distances between the lens groups are varied. Upon focusing from an infinitely distant object to a closely distant object, the third lens group is moved along the optical axis. At least a portion of the rear lens group constitutes a vibration reduction lens group having negative refractive power and moveable perpendicular to the optical axis. An optical apparatus and a method of manufacture are also provided.

Variable magnification optical system, optical device, and method for producing variable magnification optical system

A variable magnification optical system includes, in order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group and a distance between the second lens group and the third lens group being varied. The variable magnification optical system further includes a V lens group GV having negative refractive power and being moved to have a component in a direction perpendicular to the optical axis, and an F lens group GF having positive refractive power and being moved along the optical axis upon focusing from an infinitely distant object to a close object, the V lens group GV being disposed on the more object side than the F lens group GF. Thereby, it is possible to provide the compact variable magnification optical system with a high zoom ratio and high performance, an optical apparatus therewith and a method for manufacturing the variable magnification optical system.

Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system

A calculation device calculating an amount of movement in an optical axis direction of a focusing lens which adjusts a focal position of an imaging optical system includes: a first input unit to which first information about a deviation between an imaging surface which captures an image by the imaging optical system and the focal position is repeatedly input; a second input unit to which second information about a shake of the imaging optical system in the optical axis direction is repeatedly input at intervals shorter than those of the first information; and a calculation unit which calculates the amount of movement on the basis of at least one of the first information and the second information, wherein the calculation unit calculates the amount of movement on the basis of the second information between an input of the first information and an input of the next first information.

Calculation device, interchangeable lens, camera body, and imaging device

A zoom lens includes, in order from an object side along an optical axis, 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. 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 Gincreases, and a distance between the second lens group Gand the third lens group Gdecreases. Given conditions are satisfied. Accordingly, a zoom lens having high optical performance with suppressing variations in aberrations, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens are provided.

Zoom lens, optical apparatus, and method for manufacturing zoom lens

A first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, a third lens group (G) having positive refractive power, a fourth lens group (G) having positive refractive power, a fifth lens group (G) are arranged in order from an object, and a distance between the first lens group (G) and the second lens group (G), a distance between the second lens group (G) and the third lens group (G), a distance between the third lens group (G) and the fourth lens group (G), and a distance between the fourth lens group (G) and the fifth lens group (G) change upon zooming, and a lens group arranged closest to an image is approximately fixed against an image surface (I) upon zooming, and the third lens group (G) moves along the optical axis upon focusing, and the following expression (1) is satisfied.&#x2003;&#x2003;()

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

Comprising, in order from an object side: a first lens group Ghaving positive refractive power; a second lens group Ghaving negative refractive power; an aperture stop S; a third lens group Ghaving positive refractive power; and a fourth lens group Ghaving positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, the distance between the first lens group Gand the second lens group G, the distance between the second lens group Gand the aperture stop S, the distance between the aperture stop S and the third lens group G, and the distance between the third lens group Gand the fourth lens group Gbeing varied, and the distance between the aperture stop S and the fourth lens group Gbeing constant; and a predetermined conditional expression being satisfied, thereby providing a variable magnification optical system which is compact in size and has a high variable magnification ratio and high optical performance, an optical apparatus, and a method for manufacturing a variable magnification optical system.

A variable magnification optical system includes: a positive first lens group; a negative lens group closer to an image than the first lens group; a positive lens group closer to the image than the negative lens group and including at least one lens closer to the image than an aperture stop; and a focusing group between the negative lens group and the positive lens group. When varying magnification, the first lens group moves with respect to an image plane, and distances between the first lens group and the negative lens group and between the negative lens group and the positive lens group are changed. When focusing, a distance between the focusing group and a lens facing an object-side of the focusing group is changed, and a distance between the focusing group and a lens facing an image-side of the focusing group is changed. Predetermined conditional expressions are satisfied.

Variable magnification optical system, optical apparatus, and variable magnification optical system manufacturing method

An optical system comprises a first lens group Gdisposed in a most object side and having positive refractive power, a stop member ST disposed at an image side of the first lens group G, and a second lens group Gdisposed at an image side of the stop member ST. A predetermined conditional expression is satisfied, whereby light beyond the maximum angle of view collected on the focal point position of a most object side lens group having positive refractive power is reduced, so that heat generated by a member in the vicinity of the focal point position is reduced.

Optical system and optical device provided therewith

A first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, a fifth lens group are arranged in order from an object. Respective distances between the first and second lens groups, the second and third lens groups, the third and fourth lens groups, and the fourth lens and fifth lens groups change upon zooming, and a lens group arranged closest to an image is approximately fixed relative to an image surface upon zooming. The third lens group moves along the optical axis upon focusing, and the following expression (1) is satisfied:0.480&#x3c;3/&#x3c;4.000&#x2003;&#x2003;(1)where ft denotes a focal length of the zoom optical system in a telephoto end state, and f3 denotes a focal length of the third lens group.

A variable magnification optical system includes: a first lens group having positive refractive power and arranged closest to an object; a negative lens group having negative refractive power; a positive lens group which has positive refractive power, which includes at least one lens that moves integrally with an aperture stop, and which is arranged closer to an image than the negative lens group; and a focusing group arranged between the negative lens group and the positive lens group. When varying magnification, distances between the first lens group and the negative lens group and between the negative lens group and the positive lens group are changed. When focusing, distances between the focusing group and a lens facing an object-side of the focusing group and between the focusing group and a lens facing an image-side of the focusing group are changed. A predetermined conditional expression is satisfied.

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Tokyo, Japan

Akihiko Obama