The MFC-3F Follow Focus from Vocas features a direct drive design in which the focus knob and drive gear consist of only one part without any internal gears. The direct drive design results in 1:1 transmission between the focus knob and the drive gear, making it suitable for lenses with a small focus throw, such as DSLR lenses, and smaller cameras with integrated lenses. It fits lenses with 40 to 110mm focus barrel diameters.
The follow focus comes with built-in adjustable friction, which allows you to fine tune the internal friction of the unit as per your requirement. The friction can be adjusted by rotating the red dial on the focus knob. The MFC-3F follow focus is angled slightly downwards for comfort, and can be rotated horizontally. It comes with an adjustable gear ring with two movable stops.