Patent ID: 8345123

Claim:
An image sensing apparatus including a correction unit that corrects a sensed image based on correction information for an attached lens unit registered in advance in a correction information storage unit, in which the lens unit is detachable, the image sensing apparatus comprising: an acquisition unit that acquires identification information for an attached lens unit from the attached lens unit and, if the acquired identification information is different from identification information which has been acquired previously, registers in the correction information storage unit the acquired identification information and a flag indicating that correction information for the acquired identification information is not registered in the correction information storage unit; a connection unit that connects to an external device storing multiple pieces of correction information for different lens units by identification information; and a control unit that, in a case where the external device is connected to the image sensing apparatus and the flag exists, reads out correction information for the identification information corresponding to the flag from the external device, registers the read-out correction information in the correction information storage unit, and changes the flag to a flag indicating that the correction information has been registered in the correction information storage unit.