Quote: I have a easier explanation for the red you saw with the UHC red leaking filter.
You may need to read what I wrote more carefully. I did *not* see red with a "UHC red leaking" filter. The UHC I have does not have a properly-placed red secondary passband for H-alpha. I saw the red in an older Lumicon Oxygen III (OIII) line filter that had a red secondary passband which passes H-alpha at a fairly high intensity. I do not see red with my newer OIII filters that have no red secondary passband, but I *do* see faint reddish hues in M42 with the old OIII filter as well as in my DGM Optics NPB filter (which also *does* have a properly placed red passband for H-alpha).
Quote: You dislike the explanation and prefer to think you see real colors
Well, right there, you just dismissed my claim for seeing reddish colorations in M42, yet you claimed earlier that you don't do this. Which is it? I *do* see real colors in various deep-sky objects, and some other people do as well. Reddish coloration in objects like M42 and M8 is the hardest to see and is fairly rare (requires some aperture and good red-light sensitivity), but it *is* possible despite the results of the papers you cite. If you can't see it with your own eyes (and choose to rigidly believe in the generality of the papers you cite), then that is fine. However, it is *not* proof that I did not see red, nor does it invalidate the observations of other experienced amateurs. Clear skies to you.
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