Fujifilm Corporation

Shunsuke Miyagishima

Tetsuya Ori

Hiroki Saito

Atsushi Misawa

Takeshi Misawa

Michio Cho

Yukiko Nagatoshi

Nanae Sakuma

Ukyo Tomioka

Kazuyoshi Okada

Shinichiro Fujiki

Masaru Yonezawa

Yasutaka Shimada

Shigeru Kondou

An imaging lens consisting of, in order from an object side to an image side: a first lens group; a second lens group that has a positive refractive power; and a third lens group that has a negative refractive power, wherein the first lens group includes, successively in order from a position closest to the object side to the image side, two negative lenses and a positive lens, the second lens group includes a positive lens and a negative lens, during focusing from an object at infinity to a closest object, the first lens group remains stationary with respect to an image plane, and the second lens group moves along an optical axis, and assuming that a focal length of the first lens group is f1, and a focal length of the second lens group is f2, Conditional Expression (1) is satisfied: −0.5<f2/f1<0.5 (1).

Imaging lens and imaging apparatus

An observation optical system includes a display element and an eyepiece lens arranged on an eyepoint side of the display element. The eyepiece lens consists of a first lens having positive refractive power, a second lens having negative refractive power, and a rear side lens group including two or more lenses consecutively in order from a side closest to the display element to the eyepoint side. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens is denoted by f, the observation optical system satisfies a conditional expression represented by 0.3<H/f<0.5.

Observation optical system and optical apparatus

An electronic view finder includes a display element that displays an image, and an eyepiece lens that is disposed on an eyepoint side of the display element and that is used for observing the image. The eyepiece lens consists of a first lens, a second lens having refractive power of a different sign from the first lens, and a third lens having positive refractive power in order from a display element side. Diopter is adjustable by moving at least one lens of the eyepiece lens. A television distortion of the image displayed by the display element varies depending on the diopter.

Electronic view finder and optical apparatus

The finder includes, in order from an object side to an eye point side, a negative objective lens group, and a positive eyepiece lens group. The eyepiece lens group consists of, in order from the object side to the eye point side, a negative first lens, a positive second lens, and a negative third lens. During diopter adjustment, only the second lens moves. The finder satisfies a conditional expression determined in advance.

Finder and imaging device

A finder optical system includes a display element and a diffractive optical element that is disposed on an eye point side of the display element so as to continue from the display element. The diffractive optical element includes a first base, a first layer that is laminated on the first base and includes a first diffractive optical surface on a surface thereof opposite to the first base, a second base, and a second layer that is laminated on the second base and includes a second diffractive optical surface on a surface thereof opposite to the second base. The first diffractive optical surface and the second diffractive optical surface are in close contact with each other.

Finder optical system and imaging device

A finder display unit displays a live view image based on a captured image generated by an imaging unit. A digital signal processing unit detects a movement vector between frames in the live view image for a predetermined portion in the captured image. A digital signal processing unit changes a display range of the live view image on the finder display unit based on the detected movement vector of a peripheral portion in the captured image.

Imaging apparatus, and control method and control program therefor

The imaging lens consists of, in order from the object side, a positive first lens group, a stop, a positive second lens group, and a negative third lens group. Lenses arranged first and second from the object side are both negative single lenses having convex surfaces toward the object side. The second lens group includes a cemented lens in which a negative lens and a positive lens are cemented. During focusing, only the second lens group moves. Assuming that focal lengths of the first lens group and the second lens group are f1 and f2, respectively, the imaging lens satisfies 0.7&#x3c;f1/f2&#x3c;2.

The imaging lens includes at least one negative lens that satisfies predetermined Conditional Expressions (1) to (3) indicating conditions in which dispersion is relatively low and refractive index is high while having a negative rate of change of the refractive index. A positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies predetermined Conditional Expressions (4) and (5).

Imaging lens and optical apparatus

The imaging lens consists of, in order from an object side, a first lens group having a positive refractive power, a second lens group having a positive refractive power, a stop, a third lens group having a negative refractive power, and a fourth lens group. The first lens group has, in order from the object side, a positive single lens, and two or more cemented lenses. The second lens group consists of a positive lens and a negative lens. During image blur correction, only the third lens group moves. A conditional expression relating to the back focal length Bf and the lens system total length TTL is satisfied: 2&#x3c;TTL/Bf&#x3c;3.6.

The imaging lens consists of a first lens group fixed to an image plane during focusing, an aperture stop, a second lens group having a positive refractive power which moves along an optical axis during focusing, and a third lens group fixed to the image plane during focusing, in order from an object side. The first lens group includes at least two negative lenses among three lenses from a lens closest to the object side to a third lens, a negative lens of the at least two negative lenses closest to the object side being a negative meniscus lens with its convex surface toward the object side, the second lens group includes at least three lenses, and the third lens group includes at least three lenses.

The zoom lens consisting of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; a third lens group that has a negative refractive power; an intermediate part; and a final lens group that has a positive refractive power. The first lens group consists of three lenses, and has a cemented lens which is formed by cementing at least one positive lens and at least one negative lens. The second lens group consists of, in order from the object side, a negative meniscus lens, a biconcave lens, and a biconvex lens. The third lens group consists of one lens. The final lens group has a lens, which is convex toward an image side, at a position closest to the image side. Each lens group moves in a predetermined direction during zooming, and only the third lens group moves in the direction of the optical axis during focusing, and predetermined conditional expressions are satisfied.

Zoom lens and imaging apparatus

An ocular lens consists of a positive first lens group, a positive or negative second lens group, and a positive third lens group, in order from an observation object side. The first lens group consists of a positive meniscus lens with a convex surface toward an eye-point side. The second lens group includes a negative lens and a positive lens, and the number of lenses constituting the second lens group is three or less. The third lens group consists of a positive meniscus lens with a convex surface toward the eye-point side. The following conditional expression relating to a focal length of the whole system and a distance on an optical axis from a lens surface closest to the observation object side to a lens surface closest to the eye-point side is satisfied: 0.8&#x3c;f/TL&#x3c;1.1.

Ocular lens and imaging apparatus

An imaging device comprising: a first optical system formed by combining an optical system from an imaging lens to an image pickup element where a subject image is formed and an optical system from a display device where an electronic image of a subject representing an image formed at the image pickup element is displayed to an ocular unit of a finder; a second optical system which guides an optical image of the subject to the ocular unit; and a correcting device which performs, based on distortion aberration information about the first optical system and distortion aberration about the second optical system, distortion aberration correction so that distortion aberration equal to distortion aberration of the second optical system occurs in an electronic image of the subject and causes the electronic image to be displayed on the display device.

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Saitama, Japan

Shunsuke Miyagishima