There 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]
