FOCAL POINT ADJUSTING APPARATUS, IMAGE-TAKING APPARATUS, INTERCHANGEABLE LENS, CONVERSION COEFFICIENT CALIBRATING METHOD, AND CONVERSION COEFFICIENT CALIBRATING PROGRAM

摘要

A focal point adjusting apparatus comprises: a photoelectric converting unit that photoelectrically converts at least a pair of optical images and outputs at least a pair of image signals; a phase difference detecting unit that detects the phase difference between the pair of image signals that is output by the photoelectric conversion unit; a conversion unit that carries out the conversion of a phase difference that is detected by the phase difference detecting unit into a defocus amount by using a conversion coefficient; a focal point moving unit that moves the focal point position based on the defocus amount resulting of the conversion by the conversion unit; and a calibrating unit that calibrates the conversion coefficient depending on the result of the focal point moving unit moving the focal point position when the operator photographs a subject.