Metabones Canon EF Lens to Sony NEX Smart Adapter, Mark III Electronic aperture, EXIF, image stabilization, autofocus True electronic integration of aperture diaphragm - let camera automatically choose aperture in P or S exposure modes, or dial in yourself on the camera body in A or M modes. Powered by camera body. No external power source required. Wide open button (opposite of depth-of-field preview function) makes manual focusing easy. The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads. High performance 32-bit processor and efficient switched-mode power supply