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Hi Martin, good first effort. The noise can be reduced greatly when not using darks if
you enable high ISO noise reduction, and long exposure noise reduction,, when the camera will automatically take a dark after each exposure.
With your scope at prime focus, and with very good polar alignment, you can get a high
percentage of acceptable subs at 60 secs, and lower percentages as you reach out to
around 90 secs. You will get occassional acceptable subs out to 120 secs, or even a little
longer.
raymo
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