Nikon Corporation

Keigo Koida

Tomoki Ito

Masashi Yamashita

Satoshi Miwa

Katsuya Watanabe

Ayumu Makida

Azuna Nonaka

Yoko Komatsubara

Tomonori Kuribayashi

Atsushi Suzuki

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

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 zoom lens includes, in order from an object, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group. Zooming is performed by changing respective distances between the first and second lens groups, the second and third lens groups, and the third and fourth lens groups. The first lens group includes a negative lens disposed closest to the object, and a negative lens. Specified conditional expressions are satisfied.

Zoom lens, optical apparatus, and a manufacturing method of the zoom lens

A zoom lens consists of, in order from an object, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. Zooming is performed by changing respective distances between the first and second lens groups, the second and third lens groups, and the third and fourth lens groups. The first lens group consists of, in order from an object, a negative lens, a negative lens and a positive lens, the second lens group consists of five lenses, and the third lens group consists of a bi-concave negative lens.

A zoom lens comprises, in order from an object, a first lens group (G) having negative refractive power, a second lens group (G) having positive refractive power, a third lens group (G) having negative refractive power, and a fourth lens group (G) having positive refractive power to satisfy the following conditional expression:1.60&#x3c;(&#x2212;1)/&#x3c;2.50

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

A first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power are provided in order from an object. The first to fourth lens groups move on an optical axis so that zooming is performed by changing each distance between adjacent lens groups. The first lens group comprises, in order from the object, a negative lens arranged closest to the object, a negative lens and a positive lens, and when an air interval between the third and fourth lens groups in the wide-angle end state is denoted as D3T and an air interval between the third and fourth lens groups in the telephoto end state is denoted as D3T, the following condition is satisfied:0.30&#x3c;33&#x3c;1.10.

An optical system has, in order from an object: a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having negative refractive power; and a sixth lens having positive refractive power, wherein the following conditional expression (1) is satisfied: 1.52&#x3c;LR/f3 - - - (1), where LRdenotes a radius of curvature of an object side lens surface of the third lens L, and f3 denotes a focal length of the third lens L

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

Provided is an optical system having, in order from an object, a positive first lens group (G1), an aperture stop (S) and a second lens group (G2), wherein the first lens group (G1) includes, in order from the object, a negative lens component (L), a positive lens component (L) and a first lens component (L, L), the image side surface of which is a concave surface facing the aperture stop (S), the second lens group (G2) includes, in order from the object, a second lens component (L, L), the object side surface of which is a concave surface facing the aperture stop (S), and a positive lens component (L) disposed closest to the image, the first lens component (L) and the second lens component (L) face each other sandwiching the aperture stop (S), and the following conditional expressions (1) and (2) are satisfied: 1.5&#x3c;fG1/f&#x3c;2.6 . . . (1) and 2.1&#x3c;TL/f&#x3c;3.1 . . . (2), where fG1 denotes a focal length of the first lens group (G1), f denotes a focal length of the optical system (WL), and TL denotes a distance on the optical axis, from the optical surface closest to the object to the optical surface closest to the Image in the optical system (WL).

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Kawasaki, Japan

Keigo Koida