The Movo Photo FF40 is a professional grade reversible Follow Focus is compatible with standard film pitch gearing of 0.8 MOD. Fits standard 15mm rods and allows effortless and precise follow focus performance. Follow focus assists in preventing obstruction of the view during lens adjustments and allows you to create more complex shots and scenes. Quality design ensures focusing is smooth and precise even when your subject moves, and the Movo Photo FF40 Reversible Follow Focus is easy to operate. Sturdy build features low backlash; gearing is tight and can be locked for precise performance. Elevate your craft, create awesome shot effects and professional-quality results. Includes three (3) lens gears. Made from high quality aluminum, the Movo Photo FF40 Reversible Follow Focus is lightweight yet built to last. Follow focus systems of this grade typically come with a premium price tag, this unit is one of the most affordable available in its class and is a perfect for professionals and enthusiasts alike.