Quote:
Originally Posted by pkinchington
Eta Carina HOO 79x60s Ha + 128x60s Oiii. What is causing the aberration in the large bright star in the lower LHS?
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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