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That’s turned out really well. Beautiful star colour and you’ve managed to remove most of the vignetting. Well done. Unfortunately there’s not much you can do to improve the focus because of the poor conditions you had. However, for exercise purposes, something you could do to experiment with a different processing technique is to turn it into a LRGB image. Normally this done with a mono camera but for the sake of practicing the workflow you could just pretend that your DSLR is mono and treat your next imaging session as a mono run. When you get a night with better seeing take another set of subs that are as sharp as possible. Stack them and use that stack as your luminance/detail data. Since your only pretending it’s mono you can ignore the colour information in the file so no need for colour calibration or anything like that. Then combine this data set with your existing colour image for a LRGB image which should look nice and sharp.
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