Select Series Value Priced HD Telephoto ENG Style with 2x extender and Digital servo zoom & focus 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. Optional zero backlash gearing and 16 bit encoders available for robotics and virtual applications. Remote control of the 2X extender is possible with the optional model ECU-2A remote extender module.