Image capturing apparatus and control method thereof

Abstract

An image capturing apparatus comprises: an image sensor with a plurality of pixels including focus detection pixels that output signals so as to be able to acquire a pair of focus detection signals having parallax based on light fluxes that have passed through mutually different pupil regions of an imaging optical system; a movement control unit that moves incident positions of the light fluxes on the image sensor; and a focus detection unit that performs phase difference focus detection using the pair of focus detection signals. The movement control unit moves the incident positions in a phase difference detection direction a plurality of cycles during an exposure period for acquiring the pair of focus detection signals, and the plurality of cycles of movement includes movement with a first amplitude and movement with a second amplitude different from the first amplitude.