Fetures:\n- Highly compact and light-weight.\n- Quick release and easy to use.\n- Controls focus by use of lens autofocus motor.\n\nThe Sevenoak Electronic Follow Focus uses Canon's USB protocol to allow control of a wide range of functions, but without the limitations and bulk of being tethered to a computer.\n\nIt is connected to your camera with a standard A to mini-B USB cable, and can be used as a remote control or attached to a rig using a 1/4"-20 mount located on the back of the anodized aluminum enclosure.\n\nYou can easily control focus by rotating the knob in the middle or press the bottons on the electronic follow focus.