Canon Kabushiki Kaisha

Kazufumi Goto

Tomoya Yamada

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 zooming lens units configured to move along an optical axis in zooming and including a lens unit having a negative refractive power, and a final lens unit having a positive refractive power. A distance between each pair of adjacent lens units changes in zooming. The first lens unit includes, in order from the object side to the image side, a first subunit having a negative refractive power, a second subunit having a negative refractive power, and at least one subsequent subunit, a distance between each pair of adjacent subunits changing for focusing. The second subunit is configured to move along the optical axis for focusing. A predetermined condition is satisfied.

Zoom lens and image pickup apparatus

A zoom lens includes, in order from an object side to an image side, a first lens unit configured not to move for zooming, a plurality of zooming lens units configured to move in zooming, a front relay lens unit configured not to move for zooming, an extender lens unit insertable into and removable from an optical path for changing a focal length range of the zoom lens, and a rear relay lens unit configured not to move for zooming, and satisfies specific conditional expressions.

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 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.

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Utsunomiya, Japan

Kazufumi Goto