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Great shot Mark for a second image! You should be happy with that. The stars are a bit blown out. There are post processing techniques that can reduce the size of them (in photoshop you can use layers or pre set tools such as carboni reduce star size). The stars are not perfectly round, (but pretty close). This will add to the star size. Good stacking and guiding will keep stars tighter. Also, when you stretched the image to bring out the nebula you probably have enlarged the stars also. Once again, there are techniques to stretch the nebula but not the stars. A good book is Photoshop Astronomy by Scott Ireland.
Keep up the good work though!
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