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No starlight reaching acquisition system

Check the following:

• Check that the dome is not vignetting the telescope. The dome azimuth and telescope azimuth on the telescope status display should be the same. If not, someone has probably turned the dome motors off.

• Check that the primary mirror cover is open, and that the UES Nasymth flat (Nasymth 2 on the engineering console) has been selected.

• Check the mimic to make sure that the dark slide has been opened. The dark slide has to be opened manually; ask your support astronomer or telescope operator.

• Check that the autoguider filter is not in the opaque position (or Nd=5.0 or 3.0!).