The SIRUI lens rails are specially designed to stabilize the camera with large telephoto lenses.The big advantage of the TY-350 rail are the two fixed points; one on the camera and one on the lens (or lens clamp). Thus rail, camera and tripod head become one system, which is completely stable in itself. The operation of the camera with the large lens becomes much safer and easier.The rubberized contact surface of the lens plate and also of the camera exchange plate provide a firm grip. The lens rail can be moved in height and individually adjusted to the camera-lens combination.