●The NiSi Macro Focusing Rail is compatible with the Arca-Swiss mount and is equipped with an Arca-Swiss quick release plate ●New Quick Adjustment clamp with a push button. New rail for easier adjustment. New folding rotation knob ●Engraved graduated scale for precise adjustments. Tripod mounting ⅜" and ¼". Four (removable) feet for direct use on tables/surfaces. Length 200 mm with available area of 180mm. For each rotation of the knob the deviation is 1mm. ●Aluminium machined with high-precision numerical control machinery, 2-axis and 4 ways movement can be realised with two (2x) coupled NiSi NM-200s rails