1. An image pickup apparatus which is capable of shooting using a light emitting unit including a light source, and a capacitor unit that stores electric energy for causing the light source to emit light, comprising: an image pick-up unit configured to pick up an image of an object; an acquisition unit configured to acquire information on an amount of motion of the object; and a setting unit configured to set a target charge control value for the capacitor, based on the information on the amount of motion of the object acquired by said acquisition unit, wherein said setting unit sets the target charge control value to a smaller value as the amount of motion of the object is larger.