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Experienced observers do know about the little tricks the eye can play

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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.

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Without numbers this sentence is so vague that might be either true or false. How much is the variation? (citing color blind people is improper, and also the fact that a color blind person does not see color does not means that a non-color blid necessarily see the colors).
There are data on how the photopic sensitivity curve has been measured (a lot of different methods, not relying on brain processing) and there are data on variations. They may be found online too. I do not point them because I suspect that data that one finds himeself are considered in a different perspective than data tha are pointed out by somebody (me) who has a different opinion.

I invite you to find the data and point them to the community.
I renew the offer to send you (exceptionally) thet wo papers, since you cannot get them (promise that you will get them correctly when you go to the library).

Edited by Mauro Da Lio (12/02/07 05:46 AM)

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