A camera system includes a body and a camera. The body includes a controller and an image processing circuit. The camera is configured to be detachably connected to the body and includes a sensor. The sensor is configured to convert an optical image into an electrical signal and including a plurality of pixels. The controller is configured to determine a type of the camera or the first sensor according to whether one pixel or multiple pixels are used as a unit pixel of the first sensor. The image processing circuit is configured to perform predetermined image processing corresponding to the type of the camera or the first sensor on output electrical signals of the plurality of pixels.