Quote: 1) Colors are real because reliable observers have seen them. This sentence does not proof anything
I'm afraid that you still need to read more carefully what is being written here, as you are getting things a little mixed up. While it may not be proof to your personal satisfaction, it is definitely *evidence* that colors may be visible. If experienced observers did not report colors and new observers did, then it would cast doubt on the possibility. In fact, the reverse is often true, as some new to our hobby often do not report much color in their first views of M42. They merely may not have been able to notice it yet. Experienced observers do know about the little tricks the eye can play, but yet they notice the color, often without a lot of difficulty. Contrary to what has been stated as factual, some color details *do* require a little observing experience in order to be noticed, so there is at least a small amount of self-training which goes on as an observer gains more observing time and experience with larger apertures.
Quote: 2) There are large variations between persons, thus color is visible.
No, this is not what has been said. What has been said is that some people have greater color sensitivity than others and this is a factor in what colors are visible as well as how well they are seen. This is something which you have chosen to downplay. Even my two eyes show a slight but definite difference in their color sensitivity. The difference in color sensitivity between different people is quite well known, and does play a factor in what is seen with the brighter emission nebulae.
Quote: 3) A scope large enugh will show colors.
Again, you don't seem to be reading or understanding what people have said here. First, a person must have the sensitivity to the various colors in the first place. A color blind person will never see much in the way of color in nebulae regardless of the aperture, and more than a few people have very little color sensitivity at the low light levels found in astronomical objects. Other people *do* have greater color sensitivity and will be able to see colors in bright nebulae fairly easily (people like this *do* exist).
Second, larger aperture will *help* significantly with revealing color in bright nebulae, as long as the eye is sensitive enough in the first place. Most of your earlier discussion centered on claims for faint reds in M42 which you have been trying to debunk. Given sufficient aperture and a person with the right color sensitivity, color can be seen in many nebulae. I do not see very much color in NGC 6543 in my 60mm f/11.7 refractor, yet I have no trouble at all seeing its bluish-green color in my 8 inch Newtonian at 47x. It is even more stunning in a friend of mine's 30 inch Obsession, where it shows a brilliant almost lime-green hue with stunning interior detail at over 400x. The faint reds in M42 are definitely easier to see in a 30 inch Obsession than they are in my 10 inch Newtonian, although they still tend to be somewhat pastel even in a 30 inch aperture.
Please carefully consider the wording of your statements before they are made. Some of your statements about what has been said here are not at all what was really written, and other statements run counter to accepted facts known in the amateur astronomy community.
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Re: Is it possible to see the nebula with colour?
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