US 2026/0261749 A1Published application

Lens device and imaging apparatus

AssigneeFUJIFILM Corporation

InventorsTakuya TANAKA, Masaru YONEZAWA

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Abstract

The lens device is attachable to and detachable from an imaging apparatus body including a color separation prism, and includes a storage unit that stores correction data for correcting color shading of image data obtained in a case where an image formed by a zoom lens is captured through the color separation prism in the imaging apparatus body, and a communication unit that transmits the correction data to the imaging apparatus body. The correction data has a correction value that is set for each combination of a zoom state, a focus state, and an aperture state of the zoom lens. The zoom lens includes a first lens group that includes a focusing group, is disposed closest to an object side, and does not move during changing magnification, a plurality of movable lens groups that move during changing magnification, and a final lens group.

Claims20

Dependent claims

A lens device comprising:

a zoom lens,
wherein the zoom lens includes a first lens group that includes a focusing group moving during focusing, is disposed closest to an object side, and is fixed relative to an image plane during changing magnification, a plurality of movable lens groups that move while changing a spacing to an adjacent lens group during changing magnification, and a final lens group that is disposed closest to an image side and is fixed relative to the image plane during changing magnification,
the lens device
is attachable to and detachable from an imaging apparatus body including a color separation prism, and
includes a storage unit that stores correction data for correcting color shading of image data obtained in a case where an image formed by the zoom lens is captured through the color separation prism in the imaging apparatus body, and
a communication unit that transmits the correction data to the imaging apparatus body,
the correction data has a correction value that is set for each combination of a zoom state, a focus state, and an aperture state of the zoom lens at a specific image height, and
in a case where a focal length and a maximum half angle of view of the zoom lens in each zoom state are represented by f and ω, respectively, and a unit of f is mm, the specific image height is defined by 0.49×f×tan ω, and
Conditional Expression (1) represented by
1.5
mm
<
0.49
×
f
×
tan
⁢
ω
<
5
⁢
mm
(
1
)
is satisfied.

24 more elements

A lens device comprising:

a zoom lens,
wherein the zoom lens includes a first lens group that includes a focusing group moving during focusing, is disposed closest to an object side, and is fixed relative to an image plane during changing magnification, a plurality of movable lens groups that move while changing a spacing to an adjacent lens group during changing magnification, and a final lens group that is disposed closest to an image side and is fixed relative to the image plane during changing magnification,
the lens device
is attachable to and detachable from an imaging apparatus body including a color separation prism, and
includes a storage unit that stores correction data for correcting color shading of image data obtained in a case where an image formed by the zoom lens is captured through the color separation prism in the imaging apparatus body, and
a communication unit that transmits the correction data to the imaging apparatus body,
the correction data has a correction value that is set for each combination of a zoom state, a focus state, and an aperture state of the zoom lens, and
in a case where the number of the zoom states, the number of the focus states, and the number of the aperture states in groups of the combination are represented by Nz, Nf, and Na, respectively,
Conditional Expressions (2) and (3) represented by
0.05
≤
Nf
/
(
Nz
×
Na
)
≤
0.3
,
and
(
2
)
8
≤
(
Nz
×
Nf
)
/
Na
≤
2
⁢
5
⁢
6
(
3
)
are satisfied.

41 more elements

Dependencies are inferred from the claim text.