Nikon Corporation

Koichi Oshita

Hidenori Miyamoto

Hiroshi Wakabayashi

Motohisa Mouri

With comprising, in order from an object side: a first lens Lconstructed by a negative meniscus lens having a convex surface facing the object side; a cemented lens component CLhaving positive refractive power as a whole constructed by a second lens Lhaving positive refractive power and a third lens Lhaving negative refractive power; a fourth lens Lhaving negative refractive power; a fifth lens Lhaving positive refractive power; and a sixth lens Lhaving positive refractive power, and the following expression being satisfied:0.01&#x3c;2/(&#x2212;1)&#x3c;0.15where d2 denotes a distance along an optical axis between the first lens and the second lens, and f1 denotes a focal length of the first lens, a compact lens system having superb optical performance with correcting various aberrations, a wide-angle lens, an optical apparatus equipped therewith, and a method for manufacturing the lens system are provided.

Lens system, wide-angle lens, optical apparatus equipped with lens system, and method for manufacturing lens system

A camerafor forming an image using an imaging lenscomprises a distortion correction unitwhich, when a distortion of an image is corrected based on a focal length of the imaging lensand an incident angle of rays from an object to the imaging lens, changes the amount of the correction according to the incident angle.

Camera having image correction function, apparatus and image correction method

A diopter-adjustable eyepiece lens EL, comprising first through third lenses Lthrough L, satisfies the condition &#x2212;0.9&#x3c;S&#x3c;&#x2212;0.3, wherein first lens Lshape factor Sdenotes a shape factor of the first lens L, Redenotes the radius of curvature of a concave surface of the first lens Lon an eyepoint EP side and Rsdenotes the radius of curvature of a concave surface of the first lens Lon the object side. The diopter adjustment satisfies also the condition 0.4&#x3c;d/&#x3a3;d&#x3c;0.6 wherein ddenotes an air gap along the optical axis between the first lens Land the second lens Lwhen diopter adjustment is carried out so that diopter becomes maximum on the negative side, and Ed denotes an air gap along the optical axis between a concave surface of the first lens Lon the eyepoint side and a concave surface of the third lens Lon the object side when diopter adjustment is carried out so that diopter becomes maximum on the negative side.

Eyepiece lens and optical instrument comprising same

Providing a wide zoom lens system having a wide angle of view in the wide-angle end state and a high speed aperture ratio suitable for a solid-state imaging device with securing high optical performance. The system includes, in order from an object, a first lens group having negative refractive power and a second lens group having positive refractive power. The first lens group includes, in order from the object, a negative meniscus lens having convex surface facing to the object, a negative lens, and a positive lens having convex surface facing to the object. The second lens group includes, in order from the object, a positive lens, and a negative lens. At least one surface of the negative meniscus lens of the first lens group is composed of an aspherical surface. Zooming is carried out by changing a distance between the first and second lens groups. Given conditions are satisfied.

Wide zoom lens system

A lens system is disclosed that can be used in either a normal sharp-focus configuration or in any of several soft-focus configurations for obtaining, for example, sharply focused or soft-focus photographic images of an object. The lens system has simple construction and axially comprises, in the normal sharp-focus configuration and from the object side, a first lens group having positive refractive power, an aperture stop, and a rear lens group having negative refractive power. To obtain a sharp-focus image, light passes through both lens groups and the aperture stop. For obtaining a soft-focus image, the second lens group is retracted (i.e., displaced from the optical axis such that light from the object does not pass through the second lens group), and light passes only through the first lens group and the aperture stop.

Lens system with switchable soft focus

A real image viewfinder of an optical device includes an eye piece through which an optical axis may be viewed with respect to a target frame. The target frame may be used for centering an optical image on an image forming plane and also for autofocus of the optical device. The real image viewfinder includes a first prism for redefining an optical axis within the optical device. The first prism has a pair of reflective planes joined about a first ridge line. The first ridge line generally includes a number of manufacturing flaws which are noticeable by the photographer. Thus, viewfinder components are shifted by a predetermined amount to present the first ridge line in an area of the viewfinder which is different from the target frame as viewed through the eye piece. Likewise, the real image viewfinder includes a second prism having a second ridge line which is also shifted away from the target frame as viewed through the eye piece.

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Tokyo, Japan

Koichi Oshita