Cavision RFD15SC Advanced Mini Single Wheel Follow Focus for Canon Lens

The Cavision RFD15SC is an Advanced Mini Single Wheel Follow Focus mechanism for your mini-DV / prosumer camcorder and can also be used with ENG lenses. It provides a convenient, quick, and precise method for controlling the focus on your camera without the need to constantly reach over to the front of the lens. Follow focus systems have become a staple of professional photographers and videographers needing to frequently adjust a camera's focus according to changing scenes; hence the name "follow" focus.