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Hi Stephane,
Sorry to see your issue
Trial and error process unfortunately
One thing I can confirm is that the GPU coma corrector will introduce Vignetting into your image
Mine did on all my Newts 6” f6 , 8” f5 and 10” f5
Flats resolved my Vignetting easily
Maybe send an email to Diego and attach your photo , Diego is the Newt Guru
I’m sure he would be happy to advise
Good luck
Martin
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