(a) A scheme of an X-ray beam focused by a MLL with a central beamstop. Divergent orders (+) are not shown. The working distance is determined by the distance from the OSA to the focal plane. As shown in the graph, blocking the second order not the zeroth order (dotted OSA position) sets the maximum allowable working distance. (b) An X-ray beam focused by a partial MLL. A central beamstop is not necessary if the aperture of the incident beam is matched to the lens size. The maximum working distance is no longer limited by the second focusing order.