Quote:
Originally Posted by Hagar
I had always done my Flats at about the 9000 to 12000 range and had some very mixed results. Sometimes good, sometimes bad. With the RC having such a long imaging train it does suffer quite a lot from Vignetting and the old settings just didn't cut the mustard on this image. Using a max of 22000 produced much better results.
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That's interesting. I've always struggled to get correct flats on the C11 at F/10. I get them spot on with the 5" newt at F/5 with 9000ADU. Text book flat fielding - dust motes and all vigneting gone. But when I do the same levels on the C11 it's not quite there. Might try to increase the ADU see what happens. Maybe the FL does effect the illumination repartition on the CCD somehow. Will have to try next imaging session if those damn clouds want to go away that is.