FOCUS DETECTION APPARATUS, CONTROL METHOD THEREOF, AND STORAGE MEDIUM STORING PROGRAM

摘要

Light quantity information of an imaging optical system is acquired according to a focus detection position in an imaging screen. Conversion is performed from the light quantity information and a first aperture value of the imaging optical system, so that the first aperture value is converted into a second aperture value according to the focus detection position. A conversion coefficient is set according to the second aperture value and an exit pupil distance. A correction value to correct output signals from an imaging unit is obtained according to the second aperture value and an exit pupil distance.

主权项

1. A focus detection apparatus, which performs focus detection by phase difference detection based on signals output from an imaging unit which includes a plurality of microlenses being arrayed two-dimensionally over a plurality of photoelectric converters, where a focus adjustment state of an imaging optical system is detected based on the signals output from the imaging unit with respect to one microlens, the focus detection apparatus comprising:
an acquiring unit configured to acquire light quantity information of the imaging optical system, according to a focus detection position in an imaging screen; a conversion unit configured to convert, based on the light quantity information and a first aperture value of the imaging optical system, the first aperture value into a second aperture value according to the focus detection position; and a setting unit configured to set a conversion coefficient according to the second aperture value and an exit pupil distance.