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Old Tuesday 24th September 2019, 20:22   #3
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Join Date: Aug 2015
Location: Germany
Posts: 2,219

much less defocus is needed, you want 5 rings or so.

As for the line - roof prism edge was my first thought too, but it would be shocking if it was that visible... Also quite a coincidence to get it so nicely centered... As a first measure I would try to rotate the artificial star and check the line...

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