In a digital camera having a half mirror retractable out of the optical path and an optical viewfinder receiving light reflected from the half mirror, the sensitivity of an image-sensing device is set as specified by the user. When a relatively high sensitivity is specified, an image to be recorded is shot with the half mirror operated as a quick-return mirror, and, when a relatively low sensitivity is specified, an image to be recorded is shot with the half mirror kept in the optical path. A sensitivity that cannot be coped with simply by changing the position of the half mirror is set by adjusting, in conjunction therewith, the output gain of the image-sensing device.