Nikon Corporation

Optos Plc

Azuna Nonaka

Katsuya Watanabe

Tomoki Ito

Masashi Yamashita

Satoshi Miwa

Keigo Koida

Ayumu Makida

Yoko Komatsubara

Tomonori Kuribayashi

Fumiaki Ohtake

David Michael Williamson

Makoto Fujimoto

Masahiro Mizuta

Gonzalo Muyo

Miwako Yoshida

Alistair Gorman

Yasufumi Nishi

Kyoya Tokunaga

David M Williamson

An objective lens (OL) comprises, disposed in order from an object: a positive lens (L); a negative meniscus lens (L) cemented to the positive lens (L) and having a concave surface facing the object; and a positive meniscus lens (L) having a concave surface facing the object; wherein the objective lens satisfies following conditional expressions 2.03≤n1m≤2.30 and 20≤ν1m, where, n1m: a refractive index of the negative meniscus lens (L) with respect to a d-line, and ν1m: an Abbe number of the negative meniscus lens (L).

Objective lens, optical system, and microscope

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

A magnification-variable optical system having a small size, a wide angle of view, and high optical performance, an optical apparatus including the magnification-variable optical system, and a method for manufacturing the magnification-variable optical system are provided, the magnification-variable optical system ZL being used for an optical apparatus and includes a first lens group Ghaving a negative refractive power, and a rear group GR including at least one lens group disposed on an image side of the first lens group G, and is configured so that a distance between lens groups adjacent to each other changes at magnification change and a condition expressed by predetermined condition expressions is satisfied.

Magnification-variable optical system, optical apparatus, and method for manufacturing magnification-variable optical system

The ophthalmic optical system is configured to apply an angular scanning light ray to an eye. M=|ωout/ωin| is defined, where ωin represents an angle between an incident light ray to the ophthalmic optical system and an optical axis of the ophthalmic optical system, and ωout represents an angle between an exiting light ray exiting from the ophthalmic optical system toward the eye and the optical axis. The ophthalmic optical system satisfies a conditional expression Mpar<Mmax, where Mpar represents M in a case that the incident light ray is a paraxial ray, Mmax represents M in a case that the incident light ray is a ray of a maximum angle of win.

Ophthalmic optical system, ophthalmic objective lens, and ophthalmic device

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 magnification-variable optical system having a small size, a wide angle of view, and high optical performance, an optical apparatus including the magnification-variable optical system, and a method for manufacturing the magnification-variable optical system are provided. A magnification-variable optical system ZL used for an optical apparatus such as a cameraincludes a first lens group Ghaving a negative refractive power and including at least two lenses, and a rear group GR including at least one lens group disposed on an image side of the first lens group G, and is configured so that a distance between lens groups adjacent to each other changes at magnification change and a condition expressed by predetermined condition expressions is satisfied.

An objective lens (OL) comprises, disposed in order from an object: a positive lens (L); a negative meniscus lens (L) cemented to the positive lens (L) and having a concave surface facing the object; and a positive meniscus lens (L) having a concave surface facing the object; wherein the objective lens satisfies following conditional expressions 2.03&#x2264;n1m&#x2264;2.30 and 20&#x2264;&#x3bd;1m, where, n1m: a refractive index of the negative meniscus lens (L) with respect to a d-line, and &#x3bd;1m: an Abbe number of the negative meniscus lens (L).

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Yokohama, Japan

Azuna Nonaka