Frame your subjects and focus your camera with ultimate precision using the Promaster MR1 MACRO FOCUSING RAIL. Its X/Y design gives you the freedom to move your camera front to back and side to side using gear-driven controls. Lock-down knobs keep your camera steady when you are ready to press the shutter button. The MR1 features the Promaster dovetail quick release system (compatible with arca-swiss type dovetail products) for rapid attachment to a tripod (with matching receiver) as well as your camera.