An image capture apparatus comprising: an image sensor ; mount contact points for electrically connecting a lens unit when the lens unit is mounted on the image capture apparatus ; correction means arranged to correct image blurring by moving the image sensor in accordance with movement in the image capture apparatus , the image sensor capturing light from an imaging optical system , said imaging optical system being comprised in the lens unit mounted on the image capture apparatus ; control means configured to control the correction means in accordance with one of a plurality of modes, the modes including: a first mode in which the image sensor can move in a first direction perpendicular to an optical axis of the imaging optical system within a first distance; and a second mode in which, when an aperture size of a diaphragm in the imaging optical system is greater than or equal to a predetermined value, the image sensor can move in the first direction within a second distance shorter than the first distance; the image capture apparatus being characterised in that it further comprises: a setting means configured to automatically determine either the first mode or the second mode as the one of the plurality of modes, based on at least one of (i) either one of a moving image shooting mode and a still image shooting mode which is set to the image capture apparatus and (ii) a subject luminance in periphery areas of the field of view. mount contact points for electrically connecting a lens unit when the lens unit is mounted on the image capture apparatus ; correction means arranged to correct image blurring by moving the image sensor in accordance with movement in the image capture apparatus , the image sensor capturing light from an imaging optical system , said imaging optical system being comprised in the lens unit mounted on the image capture apparatus ; control means configured to control the correction means in accordance with one of a plurality of modes, the modes including: a first mode in which the image sensor can move in a first direction perpendicular to an optical axis of the imaging optical system within a first distance; and a second mode in which, when an aperture size of a diaphragm in the imaging optical system is greater than or equal to a predetermined value, the image sensor can move in the first direction within a second distance shorter than the first distance; a first mode in which the image sensor can move in a first direction perpendicular to an optical axis of the imaging optical system within a first distance; and a second mode in which, when an aperture size of a diaphragm in the imaging optical system is greater than or equal to a predetermined value, the image sensor can move in the first direction within a second distance shorter than the first distance; the image capture apparatus being characterised in that it further comprises: a setting means configured to automatically determine either the first mode or the second mode as the one of the plurality of modes, based on at least one of (i) either one of a moving image shooting mode and a still image shooting mode which is set to the image capture apparatus and (ii) a subject luminance in periphery areas of the field of view. <EOS>