I did a quick search and apparently it’s due to the Oiii channel (which makes sense as it has a teal colour to it). Apparently it can be processed out of the images. If I split the channels I don’t see it in Ha.
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Originally Posted by multiweb
1- could be a reflection on your camera window. Increasing the spacing between filter and chip can help
2- although it's uncalibrated the nebulosity and dark patch look legit.
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