Patent ID: 8000596

Claim:
A camera body to which an interchangeable lens can be attached, comprising: an imaging unit operable to generate image data from an optical signal obtained from the interchangeable lens; a detector operable to detect a light quantity of the optical signal obtained from the interchangeable lens; a controller operable to set an aperture value of a diaphragm of the interchangeable lens and an exposure condition which is a setting relating to exposure other than a setting of the diaphragm; a sending unit operable to send a control signal used for control with the aperture value set by the controller, to the interchangeable lens; and a mode setting unit operable to select an operating mode from a plurality of operating modes, wherein the plurality of operating modes includes a first mode for adjusting the aperture value of the diaphragm and the exposure condition according to the light quantity detected by the detector during capturing of a moving image, and a second mode for adjusting the aperture value of the diaphragm with the exposure condition being fixed according to the light quantity detected by the detector during capturing of the moving image, and an average drive speed of the diaphragm for adjusting the aperture value of the diaphragm in the second mode is slower than an average drive speed of the diaphragm for adjusting the aperture value of the diaphragm in the first mode.