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That attachment shows me rings on my laptop, which is outside, but I don;t see rings here on this machine indoors. This machine has a much larger Samsung monitor on it. But it's a jpg and I just thought what I was seeing on the laptop was from compression. Why not grab a free copy of deep sky stacker and see if it does it. You might have to actually process something to make it go but once done it will leave a master flat in the flat directory.
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I just checked the master flats from 25 I made yesterday and I see rings in it. But, drop it into Ps and adjust levels and the rings go. I think it's a monitor phenomenon. Our 8bit monitors can't display this stuff properly.
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