Nikon Corporation

Stanley Electric Co., Ltd

Issei Tanaka

Akihiko Obama

Norikazu Yokoi

Haruo Sato

Hiroki Harada

Satoshi Yamaguchi

Hiroshi Yamamoto

Akikazu Tanimoto

Tomoki Ito

Makoto Fujimoto

Mami Muratani

Taku Matsuo

Akira Miyaji

Motohisa Mouri

Tsuyoshi Murata

Akio Uchida

Tadashi Irie

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

An optical system includes, disposed in sequence along an optical axis starting on an object side: a first lens group having a positive refractive power, which remains fixed relative to an image surface upon focusing; and a second lens group having a positive refractive power, which moves along the optical axis upon focusing, wherein: the first lens group includes: a first partial lens group that comprises at least two positive lenses and has a positive refractive power; and a negative lens, the second lens group includes: at least one meniscus lens with a convex surface thereof facing the object side; a second partial lens group that includes at least one negative lens and at least one positive lens, and has a positive refractive power; and a cemented lens that is formed by bonding together a plurality of lenses and has a positive refractive power, wherein: a predetermined conditional expression is satisfied.

Optical system, image-capturing device comprising optical system and method for manufacturing optical system

A zoom lens includes, in order from an object side along an optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having 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 G1 and the second lens group G2 increases, and a distance between the second lens group G2 and the third lens group G3 decreases. 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.

A zoom lens has, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power. Zooming is performed by changing an air gap between the lens groups. The fourth lens group includes, in order from the object, a first positive lens component, a second positive lens component having a convex surface facing the object, and a negative lens component. A specified conditional expression is satisfied.

Zoom lens, imaging device and method for manufacturing the zoom lens

An eyepiece lens (EL) used for a viewfinder optical system (VF) for viewing, using the eyepiece lens (EL), an image formed by an objective lens (OL), an image displayed by a display member, or an object, wherein an antireflection coating () is disposed on at least one surface among the optical surfaces constituting the eyepiece lens (EL), and the antireflection coating () includes at least one layer () formed by a wet process.

Eyepiece lens, viewfinder optical system and optical apparatus equipped with the same, and method for manufacturing eyepiece lens

Comprising, in order from an object side: a first lens group Ghaving positive refractive power; a second lens group Ghaving negative refractive power; 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 first lens group Gbeing fixed in the position in the direction of the optical axis, at least the second lens group Gand the third lens group Gbeing moved in the direction of the optical axis such that a distance between the first lens group Gand the second lens group Gis increased and a distance between the second lens group Gand the third lens group Gis decreased; and a predetermined conditional expression being satisfied, thereby providing a variable magnification optical system which can suppress variations in aberrations upon zooming and having excellent optical performance from a wide angle end state to a telephoto end state, an optical apparatus, and a method for manufacturing a variable magnification optical system.

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

An optical system SL installed in a single-lens reflex camera includes, in order from an object side, a first lens group G1, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is disposed movably in a direction including a component perpendicular to an optical axis, and a given conditional expression is satisfied, thereby providing an optical system having excellent optical performance with excellent vibration reduction performance, an optical apparatus equipped with the optical system, and a method for manufacturing the optical system.

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

A zoom lens including, from an object: a front group having negative power; and a rear group having positive power, the rear group including, from the object, a positive lens, a negative lens having a concave surface facing the object, a cemented positive lens constructed by a negative lens and a positive lens, and a cemented lens constructed by a positive lens and a negative lens, the rear group further including a focusing group disposed to the object side of the positive lens La for focusing from infinity to a close object by moving from the object side to an image side, a distance between the front group and the rear group being varied thereby zooming from a wide-angle end state to a telephoto end state, and given condition being satisfied, thereby providing a downsized zoom lens having wide angle of view and excellent optical performance with fewer lenses.

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

A zoom lens optical system includes, in order from an object side along an optical axis: 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 negative refractive power; and a fifth lens group having positive refractive power, wherein upon zooming from a wide-angle end state to a telephoto end state, the first lens group being moved with respect to an image plane, a distance between the first lens group and the second lens group increasing, a distance between the second lens group and the third lens group decreasing, a distance between the third lens group and the fourth lens group varying, and a distance between the fourth lens group and the fifth lens group varying.

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

An imaging lens SL comprising, in order from an object side: a first group Ghaving positive refractive power; an aperture stop S; a second group Ghaving positive refractive power; and a third group Ghaving negative refractive power; upon focusing from infinity to a close object, the first group and the second group moving independently along an optical axis toward the object side, the first group including, in order from the object side, a front group having negative refractive power, and a rear group having positive refractive power, and the front group consisting of, in order from the object side, a positive lens and a negative lens, thereby providing an imaging lens capable of obtaining excellent optical performance upon focusing from infinity to a close object, with downsizing the optical system with a simple lens construction, an optical apparatus and a method for manufacturing the imaging lens.

Imaging lens, optical apparatus equipped therewith, and method for manufacturing imaging lens

An 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. The second lens group is moved upon carrying out focusing from an infinitely distant object to a close object, at least a portion of the third lens group is moved in a direction including a component perpendicular to an optical axis, and given conditional expressions is satisfied. Accordingly, an optical system excellently suppressing variations in aberrations generated upon vibration reduction, an optical apparatus equipped therewith, and a method for manufacturing the optical system are provided.

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

In a zoom lens system, an optical apparatus, and a manufacturing method, there are provided, in order from an object side: a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having negative power, a fifth group having positive power, and an aperture stop disposed to an image side of the second lens group. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens and second lens groups increases, a distance between the second and third lens groups decreases, a distance between the third and fourth lens groups varies, and a distance between the fourth and fifth lens groups varies. With given conditions being satisfied, high optical performance with suppressing variation in aberrations are achieved.

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

Providing a method for measuring wavefront aberration measured by detecting light that is emanated from a light source, incident on a test lens, and transmitted through the test lens, the method comprising steps of: measuring wavefront aberration in a state where an aperture stop of the test lens is fully opened; measuring a position of the center of a pupil of the test lens in a state where the aperture stop is stopped down; and expanding wavefront aberration by polynomials with making the position of the center of the pupil to be an origin, and a wavefront aberration measuring apparatus.

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Yokohama, Japan

Issei Tanaka