[shuttertalk]

If you're one of those professionals who work with tripods often and money's no object - intuitfocus has a rig that allows you to use a precision thumb controlled wheel that will adjust the zoom, aperture and focus without having to touch the lens itself.

The HF-IF1 handsfree, electro-mechanical follow-focus system enables DSLR focus to be altered by simply thumbing through a wheel. The rig can be used to dictate focus, zoom or aperture on all DSLRs with lenses from 14mm to 600mm, though the company does mention that not every single lens will play nice. As you'd expect, this essentially eliminates shake introduced by having to touch the focus ring, and it ships with a foursome of various rubber belt sizes for various lens diameters.

http://www.engadget.com/2010/08/10/intui...-on-dslrs/

Pretty interesting if you ask me - check out the link for a cool demonstration video of the smoooooothest panning and focusing you've ever seen.