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The Rosette is quite a faint diffuse neb. I used to struggle with signal to noise shooting for 3-5mins with my unmodded 450D. Much harder than brighter galaxies or most bright nebs. Actually, I ended up buying my CCD after taking stacks of DSLR subs to "fix" the problem and failing miserably. That's what started me down the slippery slope of cooled CCDs.
It really is a wonderful object though, and just goes to show just how easy Mike and other top class AP'ers (appear to) make it look when we gaze at their masterpiece renditions.
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