An image capturing apparatus includes an optical unit for forming an image of a subject, a first light extinction unit present on an optical axis of the optical unit and configured to adjust an amount of light by changing a dimension of a aperture stop thereof, a second light extinction unit to be present on said optical axis of the optical unit and configured to adjust an amount of light passing therethrough by changing a transmittance of the light, and a controller for controlling operations of said first and second light extinction units so as to make an exposure optimum at a time of photographing. The controller has precedence on the adjustment of the light amount with the first light extinction unit until a predetermined aperture stop diameter and has precedence on the adjustment of the light amount with the second light extinction unit in a state that the light is to be reduced beyond a state in the predetermined aperture stop diameter, thereby attaining optimization of the exposure.