Nikon Corporation

Yoko Komatsubara

Satoshi Miwa

Masashi Yamashita

Tomoki Ito

Katsuya Watanabe

Keigo Koida

Ayumu Makida

Azuna Nonaka

Tomonori Kuribayashi

Toshinori Take

Mami Muratani

Takeshi Umeda

Taku Matsuo

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 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

Optical system, optical apparatus, and method for manufacturing 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.

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) 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.

A variable magnification optical system comprises, in order from an object side, a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group. Upon varying a magnification, a distance between the first lens group and the second lens group, a distance between the second lens group and the third lens group, and a distance between the third lens group and the fourth lens group are varied. The first lens group consists of, in order from the object side, a negative lens and a positive lens. The second lens group consists of, in order from the object side, a positive 2a lens group, a positive 2b lens group, and a negative 2c lens group. A downsized system having high optical performance is provided.

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Yokohama, Japan

Yoko Komatsubara