A rotary hoop knife splitting machine, particularly for splitting skin free from hair, includes a knife with a cutting edge, a feeding device arranged in front of the cutting edge, wherein the feeding device includes a transport gap defined by a base and a driven transport roll, and a feeding gap defined by another base and a driven feeding roll. The camera main body is operated by the touch panel, and, when photographing is performed with the camera main body accommodated in the waterproof housing, the operation of operation buttons of the waterproof housing operate corresponding operation buttons of the camera main body. O\u2014CH2\u2014)4C\u2003\u2003\u2014CH2\u2014CH2\u2014)2S\u2003\u2003. Thus high-speed gain control is performed immediately after the start of detection of the packet signal.