Lens system and camera system

A camera system including a lens device and a camera body, wherein

• the lens device includes:
• an image formation optical system including a movable lens group, a first correction lens group whose position relative to an optical axis is changed so that optical performance of each portion of an image is corrected and a second correction lens group whose position is changed in a plane perpendicular to the optical axis so that a position of a image center is adjusted;
• and
• a drive section driving the first correction lens group and the second correction lens group;
• and
• a lens position acquisition section acquiring a lens position of the movable lens group, and wherein
• the camera body includes:
• an image capturing element acquiring the image formed by imaging performed by the image formation optical system;
• a specification section specifying a partial image of a part of region in the image acquired by the image capturing element;
• a storage section storing a data table in which correspondence is established between position information of both of the movable lens group and the first correction lens group and the optical performance of each portion of the image;
• and
• a control section, in accordance with the lens position of the movable lens group acquired by the lens position acquisition section, on the basis of the data table, acquiring a position for the first correction lens group that improves the optical performance of the partial image specified by the specification section and then controlling the drive section such as to move the first correction lens group to the acquired position, and move the second correction lens group for correcting displacement of the image center by the movements of the first correction lens group and the movable lens group on the basis of the position information of the first correction lens group.