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M27 definitely appears as an intense greenish blue "hourglass" in my 25x100 Fujinon binoculars.

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The point is that is the red part!
http://www.telescopes.cc/m27.htm

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If you look at this picture:
http://www.eso.org/public/outreach/press-rel/pr-1998/phot-38a-98-preview.jpg
You will see that while the very edges of the "bow tie" glow red, there is a distinct green bar running the length of the bowtie (squint your edges to reduce the resolution). This does not invalidate your point, though, as ALL photos of M27 show the faint outer loops as green as this deep image shows:
http://www.astrophoto.com/M27.htm
That the outer parts seem to be a reddish color visually DOES show that perception is altering reality. It could also be a contrast effect, as noted by many serious double star observers.
That colors appear more accurate visually in the Orion Nebula amy reflect on its overall brightness. And size.

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Don Pensack
12.5" Truss Dob, 5" Maksutov
Sustaining Lifetime IDA member, TeleVue junkie

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