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Is this a collimation problem, focusing, or just not well guided?
Hi folks,
I have GSO RC8 and have been trying hard to get it collimated perfectly.
But it seems that the stars are still not well rounded, they shaped like a diamond ring.
Does it mean that my collimation is still not right enough? Or it just a matter of focusing problem? or not well guided?
I took this picture of M83 at 300s with QHY9.
Thanks for your feedback guys!
Regards
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