Fully compatible with all the EF lens and you can still enjoy auto focus and imagestabilizer features Robustly built for heavy-duty use - zinc alloy dis casting core with a detachable metal stand. Prefect performance ensured- all the contact pins are made in copper then electroplated with gold for greatest conductivity All the parts are made in tight tolerance molds which make the adapter for long time and comfortable use. Electronic auto focus.Focus infinitely.high-technics treatment on the contact pinspermitting perfect signal transmitting between lens and camera. Metal Matrial Support standard 1/4 triop hole tripod etc. Improved lock button design.No problem of light leaking.