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Benji, I had hoped some of the more experienced astrophotographers would have chimed in by now, but as they have not, I will.
What camera are you using? And have you taken photos by day?
I do not understand the term "I take long e posters say around 10-30 sec"
what are e posters? are you using the mount to track?
In my view you need to start with the moon or a bright star and take 1 or 2 sec exposures and see how they work out. This will also help you with your focus.
Come back to us and give more information.
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