Image pickup apparatus and focus detection method

摘要: The image pickup apparatus includes an sensor photoelectrically converting paired object images formed by light fluxes from mutually different pupil areas of capturing optical system, a signal producing part producing, using output each plural pixel lines in focus detection area the sensor, signals corresponding to for line, calculating defocus amount produced line. shifts relatively, produce first correlation data showing change value according their relative shift amount, adds respective second data, and calculates data.