It would be cool to add direct camera support for this as a follow focus.

http://www.griffintechnology.com/products/powermate/

Greg greg at imagiclab dot com

Really confused with the Focus part of Magic Lantern Edit

I don't understand at all how to use the rack focusing in the Magic Lantern firmware. Do I need to be using a zoom lens to do it? I follow the directions on that page but nothing happens when I run the "Rack Focus". I was using my 50mm prime...don't know if that has something to do with it? I'm extremely confused...