Quote: You *do* se colors. The fact that you se *real H-aplha* is questionable, provided that there are proofs of false color perception due to a plethora of different cognitive effects.
No, under certain circumstances I can see *reddish* colors (especially in a 30 inch Obsession which I have been privileged to use on occasion). I have seen H-alpha light many times (I *Observe* in narrowband H-alpha solar filters), so my eye can easily detect this. I have a B.S. in Physics/Astronomy. I have used Hydrogen gas discharge tubes and spectrometers, so I can see what the H-alpha line looks like visually. Even when not using a spectrometer, I can see the gas discharge tube as a nice bright pink, which is very similar to (but quite a bit brighter) the shades of pink I see in M42. I can see faint reds in M42, M8, Campbell's Hydrogen Star, and in the outer shell of IC 418, *period*. So can others, so please don't imply that it is an illusion.
Quote: You have not given any proof that what you see is real (you claim it is real because you and other see it, and if somebody else does not you point him as "unable") except for some anedoctcal report (a friend seeing 7200 angstrom and the OIII filter with leaks).
It ISN'T ANECDOTAL!! This is a *fact*. My friend was a fellow Physics undergraduate at the University of Nebraska, Lincoln (two years behind me). In the spectrometer, he could see quite a number spectral lines of Neon well beyond 6500 Angstroms in wavelength (I think he made it to the 7245 Angstrom line if memory serves). He was also in the Army and confounded his instructors, as he could defeat a number of camoflage systems in the field visually simply because his eyesight went into the near infrared.
Quote: I understand however that there is no room for discussion at leas until you refuse to even read the studies I pointed out.
I did *not* refuse to do *anything*! The nearest University library is over 40 miles away, so I do not have access to the papers (at least not yet). However, I still believe (as some have already pointed out to you), that to be useful, a study of low-light color perception *must* be done with very similar light conditions and sources to those we view on the sky. Until this is done, I remain somewhat skeptical that they rigidly apply to all visual observing of faint sources. Clear skies to you.
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