Description: This adapter allows a Olympus OM Lens screw mount lens to fit for Canon EOS camera body. Integrated switch opens f/1.4 aperture diaphragm on compatible electronic lenses to help ensure focus accuracy. The ring enables camera viewfinder focus confirmation light and confirmation sound. Please installing / uninstalling the adapter after turning off the camera. It supports Infinity focus, auto focus (AF) is not available. Specification: Material: Aluminium Alloy Color: Silver Model: OM-EOS Supports AV Mode Suitable For: Lens: for Olympus OM Lens Camera: for Canon EOS DSLR and SLR Camers (Like 100D, 1100D, 1000D, 300D, 350D, 400D, 450D, 500D, 550D, 600D, 650D, 700D, 10D, 20D, 30D, 40D, 50D, 60D, 70D, 5D, 5DII, 5D III, 6D, 7D, 7DII Series) Package Includes: 1 Piece OM-EOS Lens Adapter Ring Note: Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. In this case "stop-down mode" will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body. You can shoot with manual mode or aperture priority mode
