An image sensing apparatus on which a plurality of lens units are interchangeably mountable includes a system controller configured to acquired information specific to a mounted lens unit from the mounted lens unit, a detection unit configured to detect a focus shift amount of the mounted lens unit, a display circuit configured to display the specific information acquired by the system controller in association with a focus correction value for correcting the focus shift amount detected by the detection unit, an operation switch configured to be operated by a user, and a setting unit that sets the focus correction value according to an operation on the operation switch.