On Sat, 14 Aug 2010 12:50:44 +0200, "Stefan Lilge"
wrote:

Nice image Robert.
I always wonder what the "real" colour for Halpha nebulae is, I am getting
quite a lot of variation in my images...

Stefan

Color being a perception, the closest thing to a "real" color probably
is what you see through the eyepiece.

Dalin Malin has made beautiful images:

http://www.aao.gov.au/images/general/emission.html

Something to shoot for.

Bud