This compact system snaps onto a pair of lightweight 15mm rods (rods not included). The Cine Base is designed with a 2:1 knob-to-gear ratio for quick but smooth focus pulls on cine-style lenses, with their typically large range of focus barrel rotation. The 0.8 mod/43-tooth focus gear will work with most larger prime lenses and 35mm format zoom lenses with standard 32-pitch gear rings. This set’s included standard left-sided knob is interchangeable with ARRI 2-speed and hard-stop knobs. The MFF-2 base’s reversing feature can be used to maintain the standard direction of the focusing knob when using Nikon and Leica lenses. The modular design of the MFF-2 makes it compatible with ARRI follow focus accessories such as additional lens gears, whips, speed cranks, and knob accessories.