The 503CXi is a full 6x6 format mechanical camera, interchangeable lenses, viewfinders and film magazines are available as accessories. Apart from the entry model of 501C, this model is perfect for the professional or amateur who prefers battery-free, mechanical reliability combined with an automatic dedicated flash system. Flash sync can go up to 1/500 sec with all CF lenses provides complete freedom for creating the desired lighting ratio between flash and ambient light. ISO dial on camera offers convenient changing of flash fill lighting ratio. Lens shutter with the CF lenses in the Hassleblad line up is fully compatible.