This is a stabilized super-telephoto ENG style lens for large venues or sporting events. It comes with lens support bracket and digital servo remote control for full servo studio control, robotics, jibs, tower cams, teleconferencing and other applications where remote control of zoom, focus and iris via RS-232 serial data or traditional analog control is desired. Remote control of the 2X extender is possible with the optional model ECU-2A remote extender module.