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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.

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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.
You dimiss the huge amount of Visual Neuro Science knowledge without even considering them for the only fact that you are *sure* you see the *real* colors. 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).
With all due respect let me disagree. There is a huge difference between controlled experiments and procedures carried out by expert scientists in the field (we are speaking of people who knows how to carry out the experiments and which might be the pitfalls) and homemade checks. There also are many possible explanations for example for the OIII red that do not need to invalidate all the known science. If the razors should be invoked, here it seems to me that a explanations that does not conflict with sound prioved knowledge is to be preffered to one which is counter that. I do not know if red H-aplha is strong enough in M42 to stimulate L-cones. I think no and I will check with a H-alpha filter (but think, if nebuale were visible in H-alpha filter, there would be a market for them beside H-beta, OIII and UHC).

I understand however that there is no room for discussion at leas until you refuse to even read the studies I pointed out.

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