Canon Kabushiki Kaisha

Tomoya Yamada

Yu Inomoto

Masaru Sakamoto

Shoichi Takemoto

Kazufumi Goto

Yonghee Lee

Naotoshi Ogawa

Yotaro Sanjo

A zoom lens includes in order from an object side to an image side: a first lens unit having a positive refractive power not moving for zooming; at least three lens units moving during zooming; and a final lens unit having a positive refractive power, wherein an interval between adjacent lens units changes during zooming, a refractive index and an Abbe number of positive lenses arranged closest to the object side among positive lenses included in the first lens unit, a focal length of the first lens unit, a focal length of the zoom lens at a wide angle end, a focal length of the zoom lens at a telephoto end, and a back focus of the zoom lens at the wide angle end are appropriately set.

Zoom lens and image pickup apparatus

A zoom lens includes, in order from object side, a positive first lens unit not moving for zooming, three or more intermediate lens units moving for zooming and a positive rear lens unit, in which each interval between adjacent lens units changes during zooming, an aperture stop is arranged in the rear lens unit, in a lens unit adjacent to the rear lens unit, or between the lens unit adjacent to the rear lens unit and the rear lens unit, the first lens unit includes, in order from the object side, negative subunit not moving for focusing, positive subunit moving for focusing, and positive subunit, a focal length of the first lens unit, a length on optical axis from most image-side surface to a rear principal point of the first lens unit, focal lengths of the zoom lens at wide angle end and at telephoto end are appropriately set.

A zoom lens includes, from an object side a first lens unit (a positive refractive power) configured not to move for zooming, two or more intermediate lens units configured to move in zooming, and a rear lens unit (a positive refractive power), wherein an interval between each pair of adjacent lens units changes in zooming, the first lens unit includes, from the object side, a first lens subunit (a negative refractive power) configured not to move for focusing, a second lens subunit (a positive refractive power) configured to move for focusing, and a third lens subunit (a positive refractive power), the zoom lens satisfies specific inequalities concerning a focal length of the first lens unit, a length on an optical axis from a last surface to a rear principal point of the first lens unit, and a focal length of the zoom lens at a telephoto end.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a plurality of lens units which move in zooming, and a final lens unit having a positive refractive power, an interval between each pair of adjacent lens units changing in zooming, the plurality of lens units including a lens unit having a negative refractive power, the first lens unit including a negative lens and a positive lens, at least a part of the first lens unit moving for focusing, the first lens unit including a negative lens made of a material satisfying inequalities defined by a refractive index, an Abbe number, and a partial dispersion ratio, and the zoom lens satifying an inequality defined by a maximum value of an Abbe number of at least one positive lens of the first lens unit.

A storage medium stores correction data for obtaining a correction amount for correcting image data, obtained from an image formed by a lens apparatus, with respect to a distribution of a light amount in the image, wherein the correction data includes a coefficient of an n-th order polynomial (where n is a non-negative integer) with respect to an image height h, the coefficient corresponding to a state of the lens apparatus. The coefficient satisfies a first inequality&#x2212;0.15&#x2264;'()&#x2212;lens()&#x2264;1.98,

Storage medium, lens apparatus, image pickup apparatus, processing apparatus, camera apparatus, method of manufacturing lens apparatus, and method of manufacturing processing apparatus

A zoom lens includes: a master lens including in order from an object side: a positive first lens unit configured not to move for zooming; a negative second lens unit configured to move for zooming; at least one lens unit configured to move for zooming; and a positive relay lens unit arranged closest to the image side; and an extender lens unit configured to change a focal length range of the zoom lens by one of: being inserted in place of a lens unit arranged adjacent to the relay lens unit on the object side; and being inserted into a space adjacent to the positive relay lens unit on the object side, wherein the extender lens unit includes a positive lens Gp, and an Abbe number and a partial dispersion ratio of the positive lens Gp are suitably set.

A zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power and configured to move for zooming; and at least one lens unit configured to move for zooming. The distance between each pair of the lens units adjacent to each other is changed for zooming. The first lens unit includes a negative lens and an Abbe number and a partial dispersion ratio of the negative lens are properly determined.

A lens apparatus includes an aperture stop, configured to form an image via the aperture stop and detachably mountable to a camera apparatus, a storage storing correction data for correcting image data obtained by image pickup by the camera apparatus, with respect to a light amount distribution in the image; and a communication device configured to transmit the correction data to an external apparatus. The correction data includes a coefficient of an n-th order polynomial (n is a non-negative integer) with respect to an image height, which corresponds to each of a plurality of states of the aperture stop. Minimum F-numbers at a wide angle end a telephoto end, focal lengths at the wide angle end and at the telephoto end, and F-numbers corresponding to the correction data are appropriately set.

Lens apparatus, image pickup apparatus, processing apparatus, camera apparatus, and storage medium

Provided is a soft focus optical system configured to be arranged on an image side of an image pickup optical system, the soft focus optical system consisting of a negative lens and a positive lens, in which a conditional expression 0.950&#x3c;B&#x3c;1.050 is satisfied, where B is a magnification of the soft focus optical system, and in which a conditional expression, |(2Y)/(fn&#xd7;fp)|&#x2264;0.005 is satisfied or conditional expressions, 0.005&#x3c;|(2Y)/(fn&#xd7;fp)|; and fn/fp&#x3c;&#x2212;0.750 are satisfied, where fn is a focal length of the negative lens, fp is a focal length of the positive lens, and Y is a maximum image height of the image pickup lens.

Soft focus optical system, soft focus adapter, soft focus lens, and image pickup apparatus

Provided is a zoom lens having a wide angle of field, a high zoom ratio, and high optical performance over the entire zoom range, and being small in size and lightweight. The zoom lens includes, in order from an object side to an image side: a first positive lens unit; a second negative lens unit; a third positive lens unit; a fourth positive lens unit; and at least one rear lens unit, in which: the first lens unit is configured not to move for zooming; the second lens unit, the third lens unit, and the fourth lens unit are configured to move while changing an interval between each pair of adjacent lens units during zooming; and the third lens unit (U) is configured to move from the object side toward the image side during focusing from an object at infinity to an object at close distance.

Zoom lens and image pickup apparatus including the same

A zoom lens includes in order from an object side, a zoom lens unit that moves during zooming, and an aperture stop; and a relay lens unit that does not move for zooming, and the relay lens unit includes an extender lens unit changing a focal length range of the zoom lens by entering into and leaving from an optical path of the zoom lens, and that unit includes front, middle, and rear lens sub-units each including one positive lens and one negative lens. The following expressions are satisfied:0.250&#x3c;||&#x3c;0.200; and||&#x3c;0.200,where Np and fbp denote a refractive index and a focal length of the positive lens, Nn and fbn denote a refractive index and a focal length of the negative lens, and fb denotes a focal length of the middle lens sub-unit.

Growing community of inventors

Utsunomiya, Japan

Tomoya Yamada