A camera system includes a photographing lens having a lens memory and/or a
lens controller, and a camera body including a body controller which can
communicate with the lens memory and/or the lens controller; a first power
and a second power which can be supplied to the photographing lens. The
lens memory and the lens controller operate with the first power and the
second power, respectively, when the photographing lens is mounted to the
camera body. The body controller supplies the first power to the
photographing lens to drive the lens memory to read data from the lens
memory, and subsequently disables the lens memory and supplies the second
power to the lens controller so that the body controller and the lens
controller communicate with each other if the body controller determines,
from the lens data, that the photographing lens includes the lens
controller.
