Quote:
Originally Posted by JA
That is caused by aberrations in the lens / optics most likely a mixture of some coma and astigmatism / sagittal coma flare.
You don't say what optics you are using, but stopping down the lens or optics can help reduce it or you can reduce its appearance in image processing.
Best
JA
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Hi JA using sharpstar edphii 61mm refractor with matched 0.82x reducer/flattener giving 275mm f4.5 telescope with qhy filterwheel and Ha and Oiii filters.
Cheers Kanga