The fully optimized optical system with the fold mirror in the relay, as well as the illumination optics, is shown in Figure . The relay layout provides ample space for the flow cell and its mechanical mounting system and additionally isolates the DMD in a convenient position to allow straightforward DMD exchanges, e.g. from 1080p to XGA to suit varied experimental requirements. The quality of the imaging can be seen in Figure , which shows an image of a cross-shaped mirror pattern on a 1080p DMD captured by a camera at the DMD image position. The shapes of the images of individual mirrors are consistent with a diffraction-limited imaging at 365 nm with a numerical aperture of 0.12 as demonstrated by comparison with a simulated (in Zemax OpticStudio) aerial image insert of an isolated single mirror.