Image capturing apparatus, method of controlling the same, camera system, and storage medium

A method for controlling an image capturing apparatus provided with an image sensor operable to capture a subject image, the method comprising:

• based on an image signal obtained by photoelectrically converting the subject image in accordance with the image sensor while performing a scan operation that causes a focus lens included in an imaging optical system to move along an optical axis of the imaging optical system, performing focus detection in which a focus evaluation value indicating a degree of focus of a subject is calculated and a position of the focus lens at which the focus evaluation value is a maximum is detected;
• and
• in a case where the imaging optical system includes a reflective optical system in which a part of a light beam is blocked, calculating, based on information on the reflective optical system and information on an image forming position of the imaging optical system for each of a plurality of different spatial frequencies, a correction value for correcting a focus detection result of the focus detection.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute each step of a method of controlling an image capturing apparatus provided with an image sensor operable to capture a subject image, the method comprising:

• based on an image signal obtained by photoelectrically converting the subject image in accordance with the image sensor while performing a scan operation that causes a focus lens included in an imaging optical system to move along an optical axis of the imaging optical system, performing focus detection in which a focus evaluation value indicating a degree of focus of a subject is calculated and a position of the focus lens at which the focus evaluation value is a maximum is detected;
• and
• in a case where the imaging optical system includes a reflective optical system in which a part of a light beam is blocked, calculating, based on information on the reflective optical system and information on an image forming position of the imaging optical system for each of a plurality of different spatial frequencies, a correction value for correcting a focus detection result of the focus detection.