Aputure is very pleased to release V-Control USB Focus Controller Evolution which uses the auto-focus motor in the lenses to control focus. It improves the center wheel with appropriate dampening effect to ensure extremely precise and smoother focus control, also initiates firmware update function and its LED displays four focus points. Furthermore seven versatile buttons and a center wheel give you total control over exposure, video, and focus settings.
Main Features

Smooth focusing gives extreme experience
Professional dampening design
Switch focus points rapidly
Total live video remote
Precise exposure control
Supports firmware update
Simple operation & easy portability
Digital zoom function
Accessories for various usage
Compatibility
Canon EOS 1D Mark IV, 5D Mark II, 5D Mark III, 7D, 60D, 600D/T3i/Kiss X5,550D/T2i/Kiss X4, 500D/T1i/Kiss X3, 1100D/T3/Kiss X50, etc
Lens Compatibility
All Canon, Sigma, Tokina and Tamron auto-focus lenses are known to function.
Manual focus lenses will not have focus control, but other functions such as settings changes or video start/stop will work.