Patent ID: 8662767

Claim:
A mirrorless camera body to which an interchangeable lens unit can be mounted via an adapter, the interchangeable lens unit including a focus lens, the camera body comprising: a housing; an imaging element provided in the housing and configured to acquire an image signal of a subject; a body mount fixed to the housing and having a portion to which the adapter can be mounted, the body mount being disposed at a position away from the light receiving face of the imaging element by an amount of a flange back, the amount of flange back is a predetermined distance which remains constant, a correction determination section configured to determine whether or not to perform correction processing on lens operation information related to the operation of the interchangeable lens unit, on the basis of the flange back, a lens back and an adapter length, when the interchangeable lens unit having the lens back is mounted, and a corrector configured to perform correction processing on the lens operation information when the correction determination section determines to perform correction processing on the lens operation information, wherein: the lens back of the interchangeable lens unit being longer than the flange back, the flange back being shorter than a length obtained by subtracting the adapter length, which is a length of the adapter in the optical axis direction, from the lens back, a focal position is changed between a forward side of the imaging element and a backward side of the imaging element by moving the focus lens in an optical axis direction to set a focal position on the imaging element; the focal position for focusing at infinity is set on the imaging element by the focus lens passing an infinity end in the optical axis direction, the lens operation information includes position information about a focus lens of the interchangeable lens unit, and the corrector is configured to convert the position information into correction position information by using a correction coefficient that is a ratio of an amount of movement of a rear focal position of the interchangeable lens unit versus an amount of movement of the focus lens.