A charging connector includes a connector housing to be fitted to a power receiving connector, a connector case housing the connector housing, a lock arm arranged to be swingable about a swing fulcrum between a lock position and a release position, and a coil spring located toward a power receiving connector away from the swing fulcrum to bias the lock arm toward the lock position. The K initial symbols belong to a Galois field of order q strictly greater than 2. The container includes molded cooling device holders and a drain. The system can comprise a computer running a software program, or a microprocessor. The invention is characterised by the provision that the relay system is so structured that it produces more than one image and that the lens disposed directly on the camera body is a zoom lens.