The Movcam Mini Follow Focus MF-2 is a single-sided follow focus with a sliding base that accommodates different lens constructions. The MF-2 quickly and securely mounts 15mm rods via a tightening mechanism controlled by a silver underside knob. A standard flexi-ring comes included for lenses that don't have ring teeth. The gear drive is .8, and focus is achieved by constant damping that ensures precise focus. A focus scale helps measure focusing distances.For DSLRs and Camcorders.