Hey Andrew
That's not a bad image for the conditions (and the fact that it's an undriven dob!)
How long was your total capture time, and what moon is it?
I think it's a bit hard to tell if the shadow is smudged, given the image scale and the conditions.
If the moon was Io, which moves the fastest, try and keep your total capture time (for a colour camera) under 90 seconds. For other moons you could go up to 2 or 2.5 minutes, especially at that image scale.
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