It is a for Nikon AI/AF all Canon EOS mount adapter ring It is easy to install, remove and use It is durable and reliable for long-term use A useful thing to achieve optimal shooting effect Color: Silver material: metal Allows focusing to infinity. Auto focus (AF) is not available. Lens lock / release and stop screw. Stop-down metering is used. Spot metering mode does not work properly. Although it is possible to use the A (aperture-priority AE) mode in auto exposure, the aperture display is not available. In the P (Program AE), or S (Shutter speed-priority AE) mode, the shutter releases, but the auto exposure control does not work. The distance scale on the lens might not indicate the actual distance. Please installing / uninstalling the adapter after turning off the camera. The EOS auto focusing system doesn’t support as less as F5.6. Before your capturing you have to focusing with MAX aperture and stop down to capturing. Made of brass with chrome coating in silver color. Compatible: ALL Canon and Film SLR(as long as the body takes Canon EOS lens) Nikon AI Lens Usage: Put red marks of the adapter and lens collar together. Turn the adapter clockwise till the fixative click. Set Nikon lens Package Content: 2X for Nikon Adapter Ring