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On another note Peter Ward was correct all this time. He said my stars were square (at 300%) and he was correct. Like most people I thought a bit of slack autoguiding is adequate for a 300mm optic. By guiding as if I was recording data with a 1200mm FL optic with the 300mm optic and dithering I have been able to enhance the resolution merely by upsizing and median stacking.
The evidence is in the image.
Bert
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