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Is this a colimation issue in my refractor?
This is a sub from my Luminance Data.
Just looking at the non-symmetrical halo around Alnitak.
Is its asymmetry caused by being positioned in the top left of the image? Or should I look to my collimation?
I did check it on the night using the tube reflections method and it seemed spot on.
Cheers
Markus
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