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As with the CCD detectors the final focus is achieved by moving the ISIS collimator, and determined by using the remotely operated Hartmann shutters. Again two methods of determining the Hartmann shifts are provided.
The collimator position can be set from the ICL interface by typing:-
BCOLL <position> where the position is in the range
If a dichroic or the flat mirror are in use the spectrograph works best with the collimator near 8000, if the folding prism is in use the collimator should be near 30000. If focus is obtained far from these values it will be necessary to move the image tube in the solenoid to bring the focus near to its nominal value. This adjustment should only be attempted by RGO technical staff.