Quote:
Originally Posted by lazjen
So this discussion led me to have a search around. I can't find many images of GUM 15 and of those I found there doesn't seem to be much else there than the hydrogen emission. But, I will try for OIII sometime to see. I might try for a test shot even though it's poorly placed for me right now.
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You could try IR or Sii. Anything that is far enough from the Ha line to give you some variety with chosing a color palette.