The Sevenoak USB Follow Focus SK-F01E provides the photo and video enthusiast with a compact yet powerful device that enhances the capabilities of HD video, it's compatible with Canon EOS Digital SLR cameras, including:
EOS 5D Mark II
EOS 1D Mark IV
EOS 600D/Rebel T3i/Kiss X5
EOS 550D/Rebel T2i/Kiss X4
EOS 500D/Rebel T1i/Kiss X3
It is connected to your camera with a standard A to mini-B USB cable. This USB follow focus enables you to control focus simply by rotating the knob in the middle or press the buttons on the USB follow focus, please refer to the user manual for detailed information.
Sevenoak SK-F01E USB Follow Focus