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If you're doing manual rather than automated calibration runs, ouch, you're poking yourself with a sharp stick. Slap a CCD camera on that baby, bin 3x3 (or 4x4 with a QSI583) and run a 180+ point automated calibration. If you're permanently mounted in an observatory, a long winter night is perfect for doing a 700+ point calibration run that you won't repeat for a good long time.
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