I am wanting to buy a macro slide rail. The two brands I have heard of are Velbon and Manfroto. The Velbon has been recommended on another site, works side to side and front to back but has no scale that would be an aid for focus stacking. The Manfroto version has a scale but only works one axis. Has anyone found lack of a scale on the Velbon a hindrance in focus stacking? Any coments appriciated.