Thanks Martin and Ryan. The framing was just how I started with the camera horizontal as I was just filling in between galaxies. The images are Hoo and Sho , no RGB natural colour.
After the first round I wished that I had rotated but was not that keen to start again. If I started again I would go to portrait mode. Easy to just swing the dovetail around, just hard to change horses mid stream.
I have run the whole thing through APP again and I think that has removed the snail trail artefacts.
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