An interchangeable-lens camera including a camera body on which a lens
unit is capable to mount. The camera body includes a lens mounting unit
which is provided to the camera body and on which the lens unit is
capable to mount at least one dummy mounting unit which is provided to
the camera body and on which a device is capable to mount under the same
lens mounting system as the lens mounting unit, and a processing unit for
reading information about the lens unit mounted to the lens mounting
unit; and the processing unit for reading information about the device
mounted to the dummy mounting unit.