Quote:
Originally Posted by Atmos
There is a difference between OIII and reflection nebula. OIII is an emission line which has a teal colour whereas a reflection nebula is intrinsically blue when not obscured by dust.
A reflection nebula will not show up as a strong emission in an OIII filter.
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Thanks Colin. I guess what I called "conventional wisdom" is neither. A quick trip to Google has sorted me out. And given me a good example - our old friend the Lagoon. It's a good day that starts with you not just older but wiser too.
Peter