Machined to computer precision, this sturdy aluminum unit uses a single 15mm rail mount design that not only frees up space for other accessories, but allows the device to be mounted on either side of the camera—at any height or angle, even upside down. Precise, interchangeable 0.8 film pitch gears effortlessly mesh a 35mm lens with the adjustment knob, while measurements are marked on the dry-erase focus ring. Built to last, the Durus Follow Focus backs up its claims with a full lifetime warranty.