Patent ID: 6856764

Claim:
A camera comprising: an image-taking optical system which includes a focusing lens that is movable in an optical axis direction to carry out focusing, a drive unit which drives the focusing lens to a target position, a pulse generator which outputs pulse signals in accordance with movement of the focusing lens, and a stop judging unit which judges that the focusing lens has stopped at the target position based on pulse signals from the pulse generator, wherein the stop judging unit judges the status of the image-taking optical system, and selectively carries out, depending on the detected status of the image-taking optical system, a first stop judgement in which it is judged that the focusing lens has stopped at the target position by detecting that the count value of pulse signals from the pulse generator has reached a count value corresponding to the target position, and a second stop judgement in which it is judged that the focusing lens has stopped at the target position by detecting that the output signal from the pulse generator does not change for a predetermined period or more.