This Pro Lens Adapter from Fotodiox enables the use of your Canon FD lenses on Canon EF-mount DSLR cameras. It features a durable brass construction with stainless steel finish and a leaf spring ensures a secure connection between the lens and adapter. Additionally, through the use of a 1.4x multi-coated focus correction lens, this adapter is designed to maintain infinity focus. This correction lens can also be removed to render the adapter as an extension tube for macro shooting. This manual adapter does not maintain automatic lens control between the camera and lens; aperture priority or manual shooting modes should be used, as well as stop-down metering for exposure control.