Patent ID: 7412159

Claim:
An image pickup apparatus for controlling a drive of a focus adjustment lens within a photographic lens by taking at least a stored correction value into consideration of a detected defocus amount, comprising: an image pickup sensor which receives a light flux having passed through a photographic lens and photoelectrically converting the received light flux; a focus detection sensor which receives a pair of light fluxes from the light flux having passed through said photographic lens and photoelectrically converting the received pair of light fluxes; a first focus detection unit which detects a defocus amount based on the phase difference of an object image photoelectrically converted by said focus detection sensor; a second focus detection unit which outputs an estimation signal for estimating the contrast of the object image photoelectrically converted by said image pickup sensor; and a control unit which effects control to calculate a correction value for correcting the defocus amount based on the value outputted from said first focus detection unit and said second focus detection unit, respectively, depending on light projected by a light projecting unit, associated with the image pickup apparatus, in one light projection pattern selected from among a plurality of pattern, and store that correction value.