Adapter Ring for C Mount Lens to Canon EOS EF EFS DSLR Camera 5D 6D 7D II III 70D 80D Features: a. Make C mount lenses can be used on Canon EOS EF mount cameras. b. There is no ROM connection on the ring so diaphragm control of the lens is set manually . c. Please installing / uninstalling the adapter after turning off the camera. d. It is possible to use macro rings and other accessories. e. It can't focus to infinity, just for macro shooting (Macro shooting is difficult, please set to maximum aperture to facilitate focusing, turn the focusing ring to complete focusing, then adjust the aperture properly to obtain satisfactory depth of field). Suitable for: lens: for C mount lenses. camera: for Canon EOS EF mount cameras Package Included: Lens mount adapter x1