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Why did you have to crop it at all? Globs, especially Omega C. look much better when the image includes many surrounding stars. The image is a bit saturated brightness wise, which masks the fact that globs are made up of
a large percentage of old red stars. Here's an example of what I mean.
This image is 8 x 30secs 8" Newt. with DSLR.
Incidentally, if your darks are of the same duration as your lights, you don't
need bias frames, as darks contain bias data.
raymo
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