# Acquire a bright star (e.g. ~4th mag), roughly centre it in the acquisition camera field and continue exposing.
# Focus the telescope (start at ~2180) using the shortest possible exposure time (focusing is best done with a fainter star, but this will be sufficient for getting the position).
# Move the fold mirror out of the beam so that light can go down the central holein the guide mirror.
# Move the rear-of-slit mirror into the beam (On SpUpNIC, ''Lamp/Mirror Settings'' pane, RoS mirror change from ''Out of beam'' to ''In beam'').
# Turn on the slit illumination (in the ''Instrument Setup'' pane, ''Change'' to turn on the lamp). Tune the exposure time/LUT sliders on the TCS until you can clearly see the slit running horizontally across the acquisition image, approximately halfway up.