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That's a bloom - overflow from the chip well, caused by my camera being non-antiblooming. By being non-AB, the chip is MUCH more sensitive (my CCD is perfect for photometry), but suffers this problem. Can be fixed in many ways, so long as it is NOT in a critical detail area etc. Can also be avoided with shorter sub frames, but with an f/3.6, this is SHORT!
I really need some dark skies for LRGB-Ha.... tired of all NB...
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