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Russell
Looks very promising for a 1 x 3 minute sub
Imaging with a DSLR , particularly during the summer you will definitely need darks to remove hot pixels and dithered subs to reduce fixed pattern noise
DSLR’s take a hammering in the summer where your sensors electronics can get up to 35 to 40 deg C during long exposures
Looks like your well on your way now with tight stars at 3 minutes , also your total RMS of 0.85 is excellent
Well done !!
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