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What was the scope and setup?
It seems very even. Most of my flats show more uneveness no matter what scope. Some scopes seem more even than others and some show round bright circle with darker outside edges (FSQ with reducer for example).
I even had one that showed bright squares in the centre for some reason (filter related?).
How many images, how bright is the exposure (ADU) how did you stack them?
Greg.
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