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You may have to view each sub and see what data you have. With 10 minute subs at f3.3 there should be a lot of nebulosity showing.
Could be the first 5 subs are OK and 30 were bad from dew on the secondary. So when you stack, the 30 bad subs will override the 5 good ones.
Or your Goto was off and you are not imaging at the correct coordinates.
Cheers
Bill
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