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Thanks for your detailed reply Mariusz.
What model filter wheel did you use?
Have you compared individual shots at say, 10, 20 and 30 mins? I only ask as Shot noise might be excessive beyond 10 mins (or so I've been told!), you might get better results doing more subs of say 20 mins. Just a suggestion to try.
Either way, you're pushing your DSLR to the limit, lovely work
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