H5mm C/CS adapter ring is a connector for the use to connect the C mount lens to the CS mount camera. C mount lens is with the 17.5mm back focal length, while CS mount lens with 12.5mm back focal length. When a C mount lens is to connect to the CS mount cameras, this 5mm height C/CS mount ring can adjust the image plane of the lens to the suitable place, where the sensor is mounted.

2 colors are available for choice, white or black.