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NGC 2440 at high power is a bloody creepy alien face to me. Observe this one from a remote site miles from the nearest human if you enjoy being creeped out. One of the most memorable DSO's out there.
I haven't seen M57 show anything other than grey. But it is fantastic at mags over 200x if seeing cooperates. M42 however is distinctly green, but that's not unusual among visual observers. I also see the Eta Carina Nebula as greenish.
The most richly coloured DSO out there would have to be NGC 3242, with its deep blue hues or the Homunculus Nebula with its vivid orange lusture.
Last edited by pgc hunter; 25-02-2011 at 02:10 AM.
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