Most Follow-Focus rigs are overkill for use with a tidy little camera like the 5D MK II. The gear-driven versions I've tried are generally cumbersome and far too complex. And expensive!
Gears need to be purchased and installed and alignment is a time-consuming process. These over-sized and overly-complex focusing systems might look butch but they effectively waste the stealthy advantages of a compact capture device like the Canon 5D MK II…
When I see a problem like this, I’m compelled to find an elegant solution and I feel that I have.