The image did look good.. But more exposure never hurts... 20hrs on some targets in my opinion isn't enough.... You have to draw the line somewhere, but I think with the quality of amateur mounts these days, doing multiple night imaging runs is not out of the question for anyone... I don't class an image as "Finished" until its hit 6hrs, even then I've been pushing to 9hrs recently, and as far as 22hrs on one image..
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