The SG-1 Shoulder-Style Grip Unit from Canon enables you to control your EF lenses like regular ENG video lenses on the Canon C700. It features a grip/rocker assembly that mounts on the rods of the separately available SU-15 Shoulder Support Unit. With it, you can control record start/stop, iris/aperture, and - if supported by the lens - zoom. It connects to the camera via a 12-pin connector, which also supplies the units power.