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AstroBin

Over or under correction with flats Askar F3.9 Reducer for FRA600 · Tralfi · ... · 1 · 79 · 0

tralfi 0.00
Tralfi
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Hi there, since shortly I'm using an Fra600+reducer+6200mm pro +Oiii 3nm Filter.
I realized that may flats don't calibrate well. The final image stack is brighter in the center and also in the corners. By shifting the level of my flats (adding or substracting a certain value with pixel math) I'm not able to find the point of perfect correction. The brightness distribution is always center symetric. I don't have this issue with my FRA400+reducer.
I don't understanden what's going on.
Has anybody an idea?
Thanks in advance
tralfi
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skybob727 6.67
Bob Lockwood
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Try not using the flat and see how it looks, I have never used flats for NB images.
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