Patent ID: 7760999

Claim:
An image capturing apparatus comprising: an image sensor; a shutter, arranged between an objective lens and the image sensor, and openable to set the image sensor into an exposure enable state in which the image sensor can perform photoelectric conversion of an object image formed thereon, and closeable to set the image sensor into a light-shielding state; a dark image acquisition unit operable to cause the image sensor to accumulate charges when the shutter closes to set the image sensor into the light shielding-state to acquire a dark image; a controller operable, if an aperture size of an aperture stop is greater than a predetermined aperture size before the dark image is acquired, to control the aperture size of the aperture stop to be not greater than the predetermined aperture size during dark image acquisition; and an image processing unit operable to subtract the dark image from an image obtained by causing the image sensor to accumulate charges when the shutter opens to set the image sensor into the exposure enable state.