Fotodiox 77mm Macro Reverse Mount Adapter for using Canon EOS camera with 77mm filter thread lens Thereverse ring has no electric contact, so you will have to set your camera in manual focusing and manual exposure or aperture priority mood. Test shots may be needed for proper exposure. All metal design with a smooth surface for effortless mount Extreme macro close-up results Anodized black finishing Includes a 24 month manufacturer warranty