Fujifilm Corporation

Takuya Tanaka

Motoari Ota

Masaru Yonezawa

Yasutaka Shimada

Michio Cho

Shinkichi Ikeda

Masato Kondo

Masanao Kawana

Kazumi Koike

Tatsuro Iwasaki

Yousuke Naruse

Takayuki Noda

Hiroki Saito

Takashi Kunugise

Daiki Komatsu

Sumihiro Nishihata

Tatsuyuki Ogino

A zoom lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a subsequent group that has a plurality of lens groups, wherein: the zoom lens includes an aperture stop at a position closer to the image side than a lens surface closest to the image side in the second lens group, a lens group closest to the image side in the subsequent group includes at least one negative lens of which an object side lens surface is a concave surface being in contact with air, during zooming, a spacing between the first lens group and the second lens group changes, a spacing between the second lens group and the subsequent group changes, and spacings between all adjacent lens groups in the subsequent group change.

Zoom lens and imaging apparatus

An imaging lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a positive refractive power; and a third lens group, wherein: during focusing, the second lens group moves along an optical axis, and the first lens group and the third lens group remain stationary with respect to an image plane, the second lens group includes a stop, an Lp1 lens, which is a positive lens, is disposed closest to the object side in the second lens group, an Lp2 lens, which is a positive lens, is disposed closest to the image side in the second lens group.

Imaging lens and imaging apparatus

The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power, a second lens group that has a positive refractive power, and a subsequent group. During zooming, a spacing between the first lens group and the second lens group changes, and a spacing between the second lens group and the subsequent group changes. The subsequent groups include a focusing group that moves during focusing.

A zoom lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; an intermediate lens group that consists of one or two lens groups; and a final lens group, wherein during zooming, the second lens group moves along an optical axis, and all distances between adjacent lens groups change.

The variable magnification optical system consists of a positive first lens group, an intermediate group, and a subsequent group in order from an object side to an image side, and does not form an intermediate real image in the entire zooming range. During zooming in a first zooming mode, a distance between the first lens group and the intermediate group changes, all distances between adjacent lens groups in the intermediate group change, a distance between the intermediate group and the subsequent group changes, and all distances between adjacent lens groups in the subsequent group are stationary. During zooming in the second zooming mode, all lens groups in the first lens group and the intermediate group are stationary, and all the distances of the adjacent lens groups in the subsequent group change. The zooming in the first zooming mode and the zooming in the second zooming mode can be independent.

Variable magnification optical system and imaging apparatus

The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The first lens group consists of, in order from an object side, a negative first a lens group, a positive first b lens group that moves during focusing, and a positive first c lens group. A most-image-side lens of the first b lens group is a negative meniscus lens having a convex surface facing an object side.

The zoom lens consists of, in order from the object side, a positive first lens group that does not move during zooming, a negative second lens group that moves during zooming, a negative third lens group that moves during zooming, at least one lens group that moves during zooming, and a rear group that does not move during zooming. All distances between the lens groups adjacent to each other change during zooming. The zoom lens satisfies predetermined conditional expressions.

The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The first lens group consists of, in order from an object side, a negative first a lens group, a positive first b lens group that moves during focusing, and a positive first c lens group. The second lens group includes one positive lens and one or more negative lenses successively in order from a most object side to an image side.

The zoom lens, in order from the object side, a positive first lens group that does not move during zooming, a negative second lens group that moves during zooming, a negative third lens group that moves during zooming, at least one lens group that moves during zooming, and a rear group that does not move during zooming. All distances between the lens groups adjacent to each other change during zooming. The zoom lens satisfies predetermined conditional expressions.

The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The second lens group has a negative lens and a cemented lens successively in order from a most object side to an image side. The cemented lens of the second lens group has a first negative lens and a first positive lens successively in order from an object side to an image side. A predetermined conditional expression for the first positive lens is satisfied.

The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The fourth lens group includes a plurality of positive lenses and a negative lens disposed on a most-image-side. Assuming that an average value of Abbe numbers in positive lenses within the fourth lens group is vdp and an Abbe number of a negative lens disposed on a most-image-side of the fourth lens group is vdn, the zoom lens satisfies a conditional expression: 0&#x3c;vdp&#x2212;vdn&#x3c;15.

A zoom lens consists of a positive first lens group that is fixed during zooming, a negative second lens group that moves during zooming, a positive third lens group that moves during zooming, a positive fourth lens group that moves during zooming, and a positive fifth lens group that is fixed during zooming. During zooming from a wide angle end to a telephoto end, the fourth lens group moves from an image side to an object side, the second lens group and a composite group consisting of the third lens group and the fourth lens group pass through points where respective lateral magnifications are &#x2212;1 at the same time, the fifth lens group consists of a negative fifth A lens group that moves during anti-shake operation, and a positive fifth B lens group that is fixed during the anti-shake operation, and the lateral magnification of the fifth A lens group is negative.

A zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the first lens group is fixed, and distances between the respective lens groups change in predetermined manners. The first lens group consists of, in order from the object side, a negative lens group fixed during focusing, a positive lens group movable during focusing, and a positive lens group fixed during focusing. The lens group has on the most image side four lenses of, in order from the object side, a positive lens, a cemented lens in which a negative meniscus lens having a convex surface facing the object side and a positive lens are cemented, and a positive meniscus lens having a convex surface facing the object side.

The zoom lens consists of, in order from the object side, a positive first lens group G, a negative second lens group G, a negative third lens group G, a stop, and a positive fourth lens group G. During zooming, the first lens group Gand the fourth lens group Gremain stationary, and the second lens group Gand the third lens group Gmove. The first lens group Gconsists of, in order from the object side, a negative first lens group front group GA that remains stationary during focusing, a positive first lens group intermediate group GB that moves during focusing, and a positive first lens group rear group GC that remains stationary during focusing. The following conditional expression relating to an Abbe number &#x3bd;n1A2 of the second negative lens from the object side is satisfied: 65&#x3c;&#x3bd;n1A2&#x3c;110.

A zoom lens has, in order from an object side, a focusing unit including a focusing lens group moving for focusing, a variable magnification unit including at least two variable magnification lens groups moving while changing a mutual interval for variable magnification, an aperture stop, and an image forming unit including an image forming lens group. The image forming unit consists of, in order from the object side, an Mlens group, an MN lens group, and an Mlens group. The MN lens group is replaceable with an ME lens group that enlarges an image forming magnification. The ME lens group satisfies predetermined conditional expressions (1) to (4).

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Saitama, Japan

Takuya Tanaka