This is a versatile AI/all mount adapter ring. It is designed for easy installation, removal, and use. The adapter is durable and reliable for long-term performance. It helps achieve optimal effects. Color: Silver Material: Metal Focusing is allowed, but auto focus is not available. The lens features a lock/release mechanism and a stop screw. Stop-down metering is used, while spot metering mode may not function correctly. Although it is possible to use aperture-priority mode in auto exposure, the aperture display will not be available. In Program or Shutter speed-priority modes, the shutter will release, but auto exposure control will not operate. The distance scale on the lens may not reflect the actual distance. Please install or uninstall the adapter after turning off the camera. The auto focusing system does not support apertures smaller than F56. Before capturing, focus with the maximum aperture and stop down before shooting. Made of brass with a chrome coating in silver color. Compatible with all cameras and film SLRs (as long as the body accepts the lens). Usage: Align the red marks of the adapter and lens collar. Turn the adapter clockwise until you hear a fixative click. Set the lens in place. Package Includes: 1 Adapter Ring Note: Lighting and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3cm.