Suitable for video and industrial view High grade aluminum, fine workmanship, good When it is used: 1 The camera is port, the lens is C ports, which makes the interfaces into a consistent, but also increases the focal length 2 The camera and lens are both C ports, thus increasing the focal length The adapter is used to realize the conversion between interfaces Lens extension tube, no sliding, no paint fading, Manufacturer: Oxxggkao