Focus adjustment apparatus and method, image capturing apparatus, image capturing system, and storage medium

Abstract

A focus adjustment apparatus detects a rotation angle of a holding unit that holds an imaging unit including an image sensor and an optical system including a focus lens and that has a rotation unit that rotates the imaging unit, controls a position of the focus lens to perform focus adjustment, and, in a case where a rotation angle of the holding is detected by the first detection unit, calculates a correction amount for correcting a shift of an in-focus position according to a change amount of a distance between the imaging unit and a subject corresponding to the rotation angle. In a case where the focus adjustment is not performed in the AF mode and the subject is tracked using the rotation unit, the focus adjustment apparatus controls the position of the focus lens based on the correction amount.