'''3. Calibrations'''
'''3.1 Camera Flats'''
Taking camera flats involves interacting with the components on the bench in the Coude room. '''Please be extremely careful not to touch anything except the flatfield screen and the lamp'''.
10) Carefully remove the lamp and screen.
'''3.2 Fibre Flats'''
At the start of an observation, take ~7 fibre flats as follows:
1) Rotate the silver knob on the GIRAFFE head on the telescope to the IN position, to insert a colour filter into the beam.
2) Select “ND Pos 1”, “Mir Pos 3” and “Lamp” in the QUARTZ “Control” panel.
3) Click the “Expose” button in the “Control” panel on the right of the QUARTZ window and enter the exposure time. Counts should be as high as possible (<50000) without saturating. Depending on prism setting, it may be necessary to use a different ND filter.
9) After readout, check the counts in the image and the information box on the bottom left – if saturated pixels are reported, reduce the exposure time.
10) If satisfied, save to disk. Expose and save 3 fibre flats.
11) On QUARTZ, click to switch OFF “Lamp”. At the telescope, rotate the silver knob on the GIRAFFE head to the OUT position.