Nikon Corporation

Nkon Corporation

Satoshi Miwa

Tomoki Ito

Ayumu Makida

Masashi Yamashita

Yoko Komatsubara

Hiroshi Yamamoto

Hiroshi Yabumoto

Katsuya Watanabe

Keigo Koida

Azuna Nonaka

Tomonori Kuribayashi

Takeshi Suzuki

Takeru Uehara

Keisuke Tsubonoya

Haruo Sato

Toshinori Take

Mami Muratani

Taku Matsuo

Fumiaki Ohtake

Atsuki Ito

Akino Kondo

An optical system (LS) has an aperture stop (S), and a positive lens (L) disposed closer to the object side than the aperture stop (S). The positive lens (L) satisfies the following conditional expressions.−0.010<1−(2.015−0.0068×ν1)50.00<ν1<65.000.545<θ1−0.010<θ1−(0.6418−0.00168×ν1)where ndP1 is the refractive index to the d line of the positive lens, νdP1 is the Abbe number with respect to the d line of the positive lens, and θgFP1 is the partial dispersion ratio of the positive lens.

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

An optical system used in an optical apparatus is configured to include a first lens group having positive refractive power, a focusing group that moves along an optical axis at focusing, and a rear group, in order from an object side, so that the first lens group includes a first-A lens group disposed on the object side of the largest air space A in the first lens group, and that all of the following conditional expressions are satisfied:1.00<×()<2.50 and 0.30<1<0.85where FNo is the f-number of the optical system focusing on infinity, TL is the total optical length of the optical system focusing on infinity, f is the focal length of the optical system focusing on infinity, dA is the length on the optical axis of the air space A, and dG1 is the length on the optical axis of the first lens group.

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

An optical system and an optical apparatus that have favorable imaging performance and a method for manufacturing the optical system are provided. An optical system OL includes, sequentially from an object side, a front group Ghaving positive refractive power and a focusing group Gthat performs focusing by moving in an optical axis direction, the front group Gincludes, sequentially from the object side, a first lens L, a second lens L, and a third lens L, and the optical system OL satisfies a condition expressed by an expression below,0.10<23/1<0.75

A zoom optical system (ZL), comprises, in order from an object: a first lens group (G) having a positive refractive power; a second lens group (G) having a negative refractive power; a third lens group (G) having a positive refractive power; a fourth lens group (G) having a positive refractive power; a fifth lens group (G); and a sixth lens group (G). In the zoom optical system, upon zooming, a distance between the adjacent lens groups changes. The zoom optical system satisfies the following conditional expression.1.00<4/3<3.00

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

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.

A zoom optical system (ZL) comprises, in order from an object: a first lens group (G) having a positive refractive power; and a second lens group (G) having a negative refractive power, wherein upon zooming, a distance between the adjacent lens groups changes. The zoom optical system further comprises an aperture stop (S) disposed closer to an image than the second lens group (G, and satisfies the following conditional expression:0.10<<0.90

This optical system (LS) has an aperture diaphragm (S) and a negative lens (L) disposed closer to an object side than the aperture diaphragm (S) and satisfies the following conditional expression.−0.010<1−(2.015−0.0068×ν1),50.00<ν1<65.00, 0.545<θ1,−0.010<θ1−(0.6418−0.00168×ν1). Where, ndN1 is a refractive index of the negative lens with respect to a d-line,

An optical system (LS) has a lens (L) that satisfies the following conditional expressions.−0.010<−(2.015−0.0068×ν)50.00<ν<65.00 0.545<θ−0.010<θ−(0.6418−0.00168×ν)

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

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,νLZ<35.0, and0.702<θFLZ+(0.00316×νLZ),

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

An optical system (LS) has an aperture stop (S), and a negative lens (L) disposed closer to the image side than the aperture stop (S) and satisfying the following conditional expressions.−0.010<2−(2.015−0.0068×ν2),50.00<ν2<65.00,0.545<θ2,−0.010<θ2−(0.6418−0.00168×ν2)where ndN2 is the refractive index to the d line of the negative lens, νdN2 is the Abbe number with respect to the d line of the negative lens, and θgFN2 is the partial dispersion ratio of the negative lens.

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,+(0.01425×)<2.12, andν35.0,where ndLZ: a refractive index of the lens with reference to d-line, and

[Problem to be Solved] There are provided an optical system having good imaging performance, an optical apparatus, and a method for manufacturing the optical system. [Solution] An optical system OL used in an optical apparatus, such as a camera, includes a diffractive optical element GD and at least one specific lens Lp, which is a lens made of crystalline glass. The specific lens Lp satisfies the condition expressed by the following expression: &#x3b8;gFp+0.0017&#xd7;&#x3bd;dp&#x3c;0.730, where &#x3b8;gFp represents partial dispersion ratio of a medium of the specific lens Lp, and &#x3bd;dp represents the Abbe number of the medium of the specific lens Lp at a d line.

An optical system (LS) Includes lenses (L22,L23) satisfying the following conditional expressions,&#x3c;35.0, and0.702&#x3c;&#x3b8;+(0.00316&#xd7;&#x3bd;),where &#x3bd;dLZ: Abbe number of the lens with reference to d-line, and

An optical system (OL) used for an optical apparatus such as a camera () includes a focusing group (Gf) that moves upon focusing, a diffractive optical element (GD) disposed on an object side of the focusing group (Gf) and a negative lens element (L1) disposed on the object side of the diffractive optical element (GD). The optical system (OL) satisfies the following expressions0.030&#x3c;&#x3c;0.0501+0.006&#xd7;&#x3bd;1&#x3c;1.91035&#x3c;&#x3bd;1where,

Provided is a photographing lens (ML) including a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, and a third lens group (G) having positive refractive power, the photographing lens being configured such that the second lens group (G) moves along the optical axis upon focusing from an object at infinity to an object at a finite distance. The first lens group (G) includes a front lens group (G) and a rear lens group (G) having a longest air interval from the front lens group (G) in the first lens group (G), and the second lens group (G) includes a negative lens (L) and a cemented lens in which a positive lens () and a negative lens () are cemented in order from the object.

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Yokohama, Japan

Satoshi Miwa