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thanks for the comments. Regarding those 'flares', it might not be as noticeable in the uploaded photo, but in the original you can see that they seem to point towards the centre of the image. Also, I'm fairly confident it's not anything to do with the location/orientation of my setup, it seems to occur quite consistently no matter where I setup. I originally thought that it was just what the brighter stars do with longer exposures on a dlsr, until I saw other images here that don't show it.
And yes, I did use the DBE tool and it was very helpful even without having flats. The only thing it couldn't handle was a couple of dust motes (which the flats actually completely removed).
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