This FD to EF adapter allows you to use Canon FD manual focus lenses on your Canon EOS camera. Fully functional with all Canon EOS cameras, both film and digital. Attach the adapter to your EOS camera the same way as you attach a lens. Then simply attach your FD lens or accessory to the adapter. This adapter includes a very high quality optical element which is superior to most of the cheaper FD-EOS adapters commonly available. Very expensive to buy in shops. In our experience, this is one of the best FD to EF adapters currently available. It also allows infinity focus.