Image pickup apparatus to which a lens unit with a focus lens is attachable and capable of performing accurate and fast focus detection, method of controlling image pickup apparatus, and non-transitory computer-readable storage medium

Abstract

An image pickup apparatus where a lens unit including an image pickup optical system including a focus lens is attachable, includes an image pickup element, a control unit that controls drive of the focus lens based on a focus signal, and an acquisition unit that acquires type information of the lens unit, and the control unit performs a first scanning operation of driving the focus lens in a first direction and perform a second scanning operation of driving the focus lens at a lower speed than a predetermined speed in a second direction after the first scanning operation, and determines whether to perform the second scanning operation based on the type information in a case where a drive speed of the focus lens when an in-focus position is detected based on the focus signal acquired during the first scanning operation is higher than the predetermined speed.