The blue metallic box below the acquisition/guider box contains the filter wheel(s), labelled on the East and West sides. Each wheel has 8 filter positions; position 1 is the reference and position 8 is always empty, so that with two wheels installed, one wheel should always have position 8 in the beam (unless one wheel contains neutral density filters). '''Filters must not be removed from the filter wheels.'''
You will have been allocated the appropriate wheel(s) for your run based on Throughout 2020, the filters specified in your observing proposal. A '''filter wheel rota''' can be found pinned to the notice board on the South pier. It details the filter in each position of each wheel and the name of the wheel(s) you have been allocated. If the incorrect wheel is in the telescope1-m wheels will be as follows: {| class="wikitable" border="1"|-! Wheel A1! Wheel B1! header 3|-| 1, please contact a technician. Please direct any other filtercell 1| 2, cell 2| row 1, cell 3|-related enquiries to hannah at saao.ac.za.| row 2, cell 1| row 2, cell 2| row 2, cell 3|}
=== The old warm room ===
