The Sevenoak SK-F1X Follow Focus is a simple but useful follow focus built out of anodized aluminum construction. It is designed to attach to a single bar of the 15mm support system, which has several advantages. While changing lenses, you can simply release one knob with a simple twist and hinge the Follow Focus unit aside to access the lens without any obstruction. If the new lens has a different diameter, SK-F1X Follow Focus can be easily hinged in place to accommodate the new diameter of the lens with a one hand operation. Also, when the gear is not at the same distance, the unit can be shifted forward or backwards.