Patent ID: 8208802

Claim:
A focusing position determining apparatus comprising: a photoelectric conversion device configured to convert light from a subject incident on an imaging surface into an electric signal; a focus lens configured to focus the light from the subject onto the imaging surface; a contrast value calculating unit configured to calculate a contrast value in an image signal from the electric signal; a focusing position detector configured to determine a focusing position of the focus lens when the light from the subject is focused on the imaging surface by using a peak of the contrast value; a focus lens driving unit configured to drive the focus lens through a first range of positions as a first drive and configured to drive the focus lens through a second range of positions as a second drive, wherein the second range is based on a position of the location of the focus lens where the contrast value is at a peak in the first drive; and an aperture control unit configured to control a quantity of light incident on the imaging surface from the subject during the first drive based on a first predetermined aperture value and configured to control the quantity of light based on an aperture value used when capturing an image in the second drive.