Okii-mc1-224x119There are a couple of USB follow focus controllers out there -- the Okii FC1 and Helmsman come to mind -- but not all controllers are follow focuses. Instead, some simply let you start/stop recording, adjust exposure, and change settings. Here's a preview from HD Cam Team of the Okii MC1 USB controller (though at the time of the video the brand had yet to be revealed):

Here's the feature list.

  • Initiates video start/stop, image capture, digital zoom, autofocus, and live view
  • Controls ISO, aperture, and shutter speed (while not recording)
  • Optional 11-minute recording restart
  • Does not interfere with HDMI output for external monitor or electronic viewfinder use
  • Uses standard mini-B to A USB cables (the same cable for connecting a Canon camera to a computer)
  • Non-powered USB extension cables extend range to 25+ meters
  • 30+ hour battery life on two AAA alkaline batteries
  • Compatible with lithium and rechargeable AAA batteries
  • Three 1/4"-20 threaded mounting points on the top and sides
  • Constructed of CNC milled 6061 aluminum
  • Approx. 3" x 1.5" x .75" dimensions and 3.4 oz (96g) total weight with included batteries
  • Made in the USA

Link: Okii MC1 USB Mini Controller

[via Notes on Video]