An image pickup apparatus having removably attached thereto a lens apparatus including a blur correction unit includes a selection unit configured to select a first mode in which a mechanical shutter is used to start exposure or a second mode in which an electronic shutter is used to start exposure; and a controller configured to output information indicating the start of exposure to the lens apparatus. The controller changes the information indicating the start of exposure depending on whether the first mode or the second mode is selected to control the lens apparatus to perform different blur correction operations.