The wording you used in the initial statement implied that you doubted any red would be visible at all ever, and that was the problem.
I think I was clear: I wrote "I doubt". That means that I do not discard the possibility, but frankly I personally think that H-alpha is very very unlikely (will see with an H-aplha filter). I have a easier explanation for the red you saw with the UHC red leaking filter. I will tell you.
You still did not read the papers. I think you should read them and, only after that, you are entitled to rebut them.
Quote: While a few people may be mislead into thinking they are seeing color at low light levels when they are not, when two very prominent and experienced amateurs who are well-known (at least in the U.S.) say they saw pinks or reds in M42, I would tend to believe them.
I do not. The regions you point out are at surface brightness below 18+ (correct me) and is at the limit and probably below the color threshold (figure H-aplha). Instead of thinking that something in contrast with what is known, is happening I prefer to find a simpler explanation especially when this kind of experience is explained by a serius paper by experts in the field of visual neuro sciences and agrees with a huge amount of scientific literature in that filed. I prefer to think that the explanation is correct. You dislike the explanation and prefer to think you see real colors (it is possible perhaps in very few case, but honestly the visual-neuro-science explanation is more credible). I believe that real colors are possible only for the green strongest OIII.
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Re: Is it possible to see the nebula with colour?
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