It is a AI/AF all mount adapter ring It is easy to install, remove and use It is and reliable for long-term use A useful thing to achieve optimal effect Color: Silver material: metal Allows focusing to . Auto focus (AF) is . 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 . 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 auto focusing system doesn’ 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 and Film SLR(as long as the body takes lens) AI Lens Usage: Put red marks of the adapter and lens collar together. Turn the adapter clockwise till the fixative click. Set lens Package Content: 1X Adapter Ring Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.