Nikon Corporation

Tamron Company, Ltd.

Hiroki Harada

Issei Tanaka

Masahide Tanaka

Hiroshi Yamamoto

Akihiko Obama

Hiroyuki Matsumoto

Toshinori Take

Dayong Li

Taku Matsuo

Satoshi Kazahaya

Keisuke Tsubonoya

Kentaro Terao

Hiroki Ono

An optical system comprises, in order from an object side, a front group having positive refractive power and a rear group. Upon carrying out focusing, the front group is moved along the optical axis. A predetermined conditional expression is satisfied. Thus, an optical system having a superb optical performance being able to correct superbly various aberrations and being suitable to be used with an imaging device having highly increased number of pixels, an optical equipment equipped therewith and a manufacturing method for the optical system are provided.

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

A zoom optical system (ZL) includes: a first lens group (G) having negative refractive power; a second lens group (G) having positive refractive power, the second lens group (G) being disposed further toward an image than the first lens group (G); and a succeeding lens group (GL) having a vibration-isolating group (GVRb) that moves so as to have a displacement component in a direction orthogonal to an optical axis, the succeeding lens group (GL) being disposed further toward the image than the second lens group (G), a distance between the first lens group (G) and the second lens group (G) changing and a distance between the second lens group (G) and the succeeding lens group (GL) changing upon zooming, and the following conditional expression being satisfied:4.899&#x2264;|1|&#x3c;1000.000where f1VRaw is a composite focal length in a wide-angle end state of a lens disposed further toward the object than the vibration-isolating group, and fw is a focal length of the whole system in the wide-angle end state.

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

A variable magnification optical system comprises: a first lens group having a negative refractive power; at least one positive lens disposed closer to an image side than the first lens group; an aperture, the at least one positive lens being disposed between the first lens group and the aperture; an intermediate group having a plurality of lenses disposed closer to the image side than the aperture; and a vibration-reduction lens group disposed closer to the image side than the intermediate group. The plurality of lenses of the intermediate group integrally move upon varying magnification, and the system satisfies the conditional expression 1.500&#x3c;f(1&#x2dc;Gn)t/ft&#x3c;100.000, where f(1&#x2dc;Gn)t denotes a composite focal length from the first lens group to the intermediate group in a telephoto end state, and ft denotes a focal length of the entire system in the telephoto end state.

Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system

A variable magnification optical system includes: a first lens group (G) having a negative refractive power; a second lens group (G) having a positive refractive power; an intermediate group (Gn) disposed closer to an image side than the second lens group (G); and a vibration-reduction lens group (VR) disposed closer to the image side than the intermediate group (Gn) and configured to be movable so as to have a component in a direction orthogonal to an optical axis. The system performs varying magnification by changing at least the distance between the first lens group (G) and the second lens group (G) and the distance between the second lens group (G) and the intermediate group (Gn), and the system satisfies Conditional Expression (1).1.000&#x3c;(1&#x2dc;)&#x3c;100.000&#x2003;&#x2003;(1)

A variable magnification optical system includes: a first lens group (G) having a negative refractive power; a second lens group (G) having a positive refractive power; an intermediate group (Gn) disposed closer to an image side than the second lens group (G); and a vibration-reduction lens group (VR) disposed closer to the image side than the intermediate group (Gn) and configured to be movable so as to have a component in a direction orthogonal to an optical axis. The system performs varying magnification by changing at least the distance between the first lens group (G) and the second lens group (G) and the distance between the second lens group (G) and the intermediate group (Gn), and the system satisfies Conditional Expression (1).1.500&#x3c;&#x3b2;()&#x3c;100.000&#x2003;&#x2003;(1)

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

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

An imaging apparatus includes: an imaging unit that repeatedly captures images of a subject to obtain image information; a recording unit that records timing information indicative of a given point in time during an imaging period of the image information; and a display unit that displays an image corresponding to the timing information, which is extracted from the image information, in response to an end of the imaging period.

Camera capable of taking movie

A wide-angle lens LN consists of, in order from an object side: a first lens group Grhaving positive refractive power; and a second lens group Grhaving positive refractive power; the second lens group Gris movable toward the object side with fixing the first lens group Gr, thereby carrying out focusing on a close object, and a given conditional expression is satisfied. Therefore, a wide-angle lens having high optical performance with suppressing variation in aberrations upon focusing in spite of being a large aperture, an imaging optical apparatus equipped therewith, and a digital equipment are provided.

Wide-angle lens, imaging optical apparatus and digital equipment

A zoom optical system comprising, in order from an object side: a first lens group Ghaving positive refractive power; a second lens group Ghaving negative refractive power; and a rear lens group GR having positive refractive power; the rear lens group GR including at least a third lens group Gthat is disposed to the most object side and has positive refractive power, the third lens group Gincluding at least four positive lenses L-L, Land at least one negative lens L, at least a portion of a lens group disposed to an image side of the first lens group Gbeing movable as a vibration reduction lens group in a direction including a component perpendicular to an optical axis, and a given conditional expression being satisfied, thereby providing a zoom optical system having excellent optical performance.

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

The present invention is directed to wide-angle zoom lenses dedicated to single-lens reflex digital cameras, which attains zoom ratio greater than 2. Such a wide-angle zoom lens has four groups of lens pieces, namely comprising the leading or foremost 1st lens group of negative refractivity closest to an objective field, the succeeding 2nd lens group of positive refractivity, the third lens group of negative refractivity, and the trailing 4th lens group of positive refractivity arranged in this order to move each lens group to vary optical power; and the 1st lens group includes a front subset of the lens pieces of negative refractive power and a rear subset of negative refractive power. The front-end lens piece in the 1st lens group is shaped in negative meniscus lens that has its concave surface faced toward an imaging plane and has the opposite surfaces shaped aspherical. The front and rear subsets of the 1st lens group meet requirements of a focal length as expressed in the following formula:3.5&#x2266;|11where f1is a focal length of the front subset of the lens pieces in the 1st lens group and f1is the focal length of the rear subset in the 1st lens group.

Wide-angle zoom lens

Providing a wide-angle lens having high optical performance, an optical apparatus using thereof, and a method for focusing the wide-angle lens. The lens including, in order from an object, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third lens group Ghaving positive refractive power. Upon varying focusing from an object locating at infinity to an object locating at close distance, the first lens group Gis fixed, and the second lens group Gand the third lens group Gare moved to the object side. The second lens group Gincludes a negative lens component Lto the most object side, and a given conditional expression is satisfied.

Wide-angle lens, optical apparatus, and method for focusing

Providing a wide-angle lens having high optical performance, an optical apparatus using the same, and a method for focusing the wide-angle lens. The lens comprising, in order from an object, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third group Ghaving positive refractive power. Upon focusing from an infinity object to a close object, the first lens group Gis fixed, and the second lens group Gand the third lens group Gare moved to the object. Given conditional expressions are satisfied.

Wide-angle lens, optical apparatus and method for focusing

Providing a zoom lens system having higher optical performance, a wide, maximum angle of view of 80 degrees or more, a zoom ratio of about 2.7, and a fast aperture ratio with an f-number of about 2.8. The zoom lens system includes, in order from an object, a first lens group Ghaving negative refractive power, a second lens Ggroup having positive refractive power, a third lens group Ghaving negative refractive power, a fourth lens group Ghaving positive refractive power; and a fifth lens group Ghaving positive refractive power. When zooming from a wide-angle end state W to a telephoto end state T, the first through fourth lens groups are moved, and the fifth lens group is fixed. Given conditional expressions are satisfied.

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Zushi, Japan

Hiroki Harada