Quote: This is contradictory in itself: you say that H-alpha at high intensity looks exactly the same color (hue and saturation) that when you supposdely see it at very faint level!!
I do wish you would stop distorting what I say. It was *not* exactly the same. What I stated was that the two colors were *similar*. This word means that the two were alike to some degree but not quite the same. Without a filter, the pinkish hues in M42 in a large scope *do* resemble the hues of a Hydrogen gas discharge tube. They are *not* at all identical, as in a large aperture, with the colors in M42, the pinkish or reddish hues are much fainter and somewhat less saturated. However, they do bear some resemblance to the gas discharge tube color, and are *really* there as several experienced observers who have replied have indicated. With a filter like the DGM Optics NPB (that has a passband taking in 6562.8 Angtroms very nicely), the color is somewhat more reddish making it stand out somewhat more than without a filter, but not extremely so.
Quote: There is a huge amount of proofs that hue perception and saturation and chroma varies. You simply do not read anything because you already know.
You simply are hung up on "reading" things which may or may not have a direct bearing on what we are observing visually in M42. I would read the papers *if* I had access to them, but you keep implying that I am just refusing to do so. This is wrong (and it is wrong for you to even imply this). I can't read the papers, so I have to go on the "proof" I have here for the moment. The Oxygen III line filter experiment I described earlier *does* indicate that the reddish color I was seeing in the nebulosity was due to red light from M42 getting into my eye and not some illusion as you seem to allege. One OIII filter had an additional red pass band and the other did not. The one with the red secondary passband showed me red, while the one with just the single standard blue-green passband for the Oxygen III lines did not. The implication of this result is fairly clear. If I put a single Wratten 23a filter in the eyepiece, the nebula is much fainter, but now looks entirely red. In the spectrum of M42, the dominant red-light emission source in the portions of the nebula away from the immediate Trapezium area is from the H-alpha line. There may be a small amount of red light from scattered continuum radiation in the nebula, but that would be secondary to the H-alpha emission, as the continuum portion of the spectrum of M42 is not extremely strong in the yellow and red portions of the spectrum.
Why you seem to almost refuse to acknowledge the validity of the Oxygen III two-filter experiment and what it implies is beyond me.
Quote: I will no longer reply to you at least until you accept to read and discuss the points as is doing Don.
That is your choice. I have read what Don has written, and he is doing just fine without any input from me. It would be nice if you would at least accept the points he made which you seem to be doing your best to downplay by going back repeatedly to your paper sources. If you don't want to believe that people have seen pinkish or reddish colors in M42, that is fine, but please don't imply that they are illusionary when they clearly may not be.
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Re: Is it possible to see the nebula with colour?
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