Figure 2: Example of Smart Slit Assembly (SSA) design solution (2) viewed from the side with a DMA operating in transmission or in reflection. Light from telescope (for instance F/3) is focused on the slit entrance (along track view) and guided through the first waveguide array (1D or 2D), imaged onto the shutter/mirror array (1D/2D DMA), re-imaged into the second waveguide array (1D/2D) and then transmitted to the spectrometer slit.