Made of black anodized aluminium (camera body mount) and brass silver (lens mount) this lens mount adapter allows the use of Canon EF lens on the Sony E-Mount NEX camera. The lens will fit physically, auto-focusing control and camera modes which control exposure by automatically adjusting aperture are not retained, however. Infinite focus is guarantee. Use the lens in the fully manual exposure mode (M) and select MF assist function to focus accurately (7x or 14x zoom focus).