Patent ID: 7702230

Claim:
A digital camera which divides light having come from a subject and passed through an aperture into two beams of light; which causes one of the divided beams of light to enter an image sensor to thereby cause the image sensor to capture an image of a subject; and which causes the other one of the beams of light to enter a focus sensor to thereby cause the focus sensor to detect a focus on the basis of the other beam of light, the camera comprising: an exposure condition determining section for determining exposure conditions, including an aperture ratio of the aperture, under which the image sensor can capture an image at appropriate exposure, in accordance with the quantity of light from the subject, wherein, when the focus sensor cannot detect a focus on the basis of the other one of the beams of light divided after having passed through the aperture, at the aperture ratio determined by the exposure condition determining section, the exposure condition determining section fixes the aperture ratio of the aperture at a minimum aperture ratio at or above which the focus sensor can detect a focus, to thus determine the exposure conditions.