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WHAT!. A typical Ha 3nm 40min bin 1 sub on my SBIG gives 1100 odd ADUS back ground uncalibrated and 50 after calibration. Bias subs show about 1000 ADUs. Are you saying I need to increase subs to several hrs for best S/N?.
Have I missed something?, my 50 ADU background after calibration, is that what you mean by "above bias"?.
What about blooming on an NABG cam!. Several Hr subs would be unusable?.
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