Camera and lens apparatus having an image blur correction function

A lens apparatus used in a camera system including a camera that includes an image sensor movable for image blur correction, the lens apparatus comprising:

• an optical element movable for the image blur correction;
• and
• at least one processor configured to set, in each blur direction of a plurality of blur directions, a ratio of image blur correction amounts provided respectively by movements of the optical element of the lens apparatus and the image sensor of the camera to a total blur correction amount, wherein the plurality of blur directions are distinguished from each other with respect to a sign of a direction, using information on an image circle formed by the lens apparatus, information on a mechanical movable amount of the image sensor, and information on a size of a signal readout area of the image sensor.

A camera used in a camera system including a lens apparatus that is detachably attachable to the camera and includes an optical element movable for image blur correction, the camera comprising:

• at least one processor configured to move an initial position of movement of an image sensor for the image blur correction to a position at which movable amounts of the image sensor in moving directions distinguished from each other with respect to a sign of a direction become equal, using information on an image circle formed by the lens apparatus.

A method of controlling a camera including an image sensor movable for image blur correction, the camera being used in a camera system including a lens apparatus that is detachably attachable to the camera and includes an optical element movable for the image blur correction, the method comprising the steps of:

• acquiring information on an image circle formed by the lens apparatus, information on a mechanical movable amount of the image sensor, and information on a size of a signal readout area of the image sensor;
• and
• setting, in each blur direction of a plurality of blur directions, a ratio of image blur correction amounts provided respectively by movements of the optical element of the lens apparatus and the image sensor of the camera to a total blur correction amount, wherein the plurality of blur directions are distinguished from each other with respect to a sign of a direction, using the acquired information on the image circle, the information on the mechanical movable amount, and the information on the size of the signal readout area.

A method of controlling a lens apparatus including an optical element movable for image blur correction, the lens apparatus being used in a camera system including a camera that includes an image sensor movable for the image blur correction, the method comprising the steps of:

• acquiring information on an image circle formed by the lens apparatus, information on a mechanical movable amount of the image sensor, and information on a size of a signal readout area of the image sensor;
• and
• setting, in each blur direction of a plurality of blur directions, a ratio of image blur correction amounts provided respectively by movements of the optical element of the lens apparatus and the image sensor of the camera to a total blur correction amount, wherein the plurality of blur directions are distinguished from each other with respect to a sign of a direction, using the acquired information on the image circle, the information on the mechanical movable amount, and the information on the size of the signal readout area.

A method of controlling a camera used in a camera system including a lens apparatus that is detachably attachable to the camera and includes an optical element movable for image blur correction, the method comprising the steps of:

• acquiring information on an image circle formed by the lens apparatus;
• and
• moving an image sensor for the image blur correction to a position at which movable amounts of the image sensor in moving directions distinguished from each other with respect to a sign of a direction become equal, using the information on the image circle.