Patent ID: 7995136

Claim:
An image sensing apparatus in which a plurality of lens units can be exchanged and attached, the image sensing apparatus comprising: an acquisition unit configured to acquire, from an attached lens unit, lens information including at least an exit pupil distance of the lens unit; an image sensor comprising a plurality of pixels for converting incident light into electrical charges corresponding to an amount of incident light; a shutter unit configured to shield the image sensor from light; a reset unit configured to sequentially reset the pixels of the image sensor in a traveling direction of the shutter unit, prior to starting to shield the image sensor from light using the shutter unit; a calculation unit configured to calculate timing for resetting the pixels such that a time period from resetting using the reset unit to shielding the image sensor from light entering through the lens unit by traveling of the shutter unit is equal for each pixel of the image sensor in a case in which the lens information fails to be acquired using the acquisition unit; an operation unit configured to receive an instruction to calculate the timing using the calculation unit; and a control unit configured to control timing for resetting the pixels using the reset unit, wherein photography is prohibited in a case in which the lens information fails to be acquired using the acquisition unit, and the prohibition is cancelled in response to completion of the calculation of the timing by the calculation unit performed in response to the reception of the instruction by the operation unit, and the control unit controls timing for resetting the pixels using the reset unit based on the timing calculated by the calculation unit.