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SLODAR is situated at the 'optical science port' behind the glass plate on which the pickoff mirror moves. It comprises a collimator, lenslet array and firewire CCD camera.
Acquisition: Each star gives a pupil image ~ 15 spots across. Rotate derot until bright star on left half of chip (used for r0), other on right, with clear separation (change tel focus if necessary), tweak rotation to make lines of spots in left and right images at approx same y (<< sepn of rows in y).
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