It is a AI/ all mount adapter ringIt is easy to install, remove and useIt is durable and for long-term useA useful thing to achieve optimal effectColor: Silvermaterial: metalAllows focusing to .Auto focus () 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 (-priority ) mode in auto exposure, the display is .In the P ( ), or S (Shutter speed-priority ) mode, the shutter releases, the auto exposure control does not work.The distance scale on the lens might not indicate the actual distance. installing / uninstalling the adapter after turning off the camera.The auto focusing system doesnt support as less as F5.6. your capturing you have to focusing with MAX 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 LensUsage:Put red marks of the adapter and lens . Turn the adapter clockwise till the fixative click. Set lensPackage Include:1X 1X Adapter RingNote: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.