The Swedish Chameleon SC4:FFOCUS is a one-rod-mount (15mm) reversible follow focus with a belt pull system in place of a traditional gear wheel system, making it smooth and precise to pull focus. A timing belt made durably with Kevlar core loops around a belt wheel on the follow focus and around the focus ring of a lens. At the turn of the focus wheel, the belt pulls focus accurately without any play. It works with any diameter still lens or cinema lens. A major benefit of the belt system is that you don't have to keep the follow focus right next to the camera. On the SC4:FFOCUS, the angle is freely adjustable even when tightened.