Quote: If one looks through OIII filter without the red leak keeping the filter close enough to the eye so that no stray light is seen, one will see something like this:
No, I see a bluish-green coloration to *everything* when using my OIII that only has the 110 nm FWHM OIII passband. In order to see other colors with that filter, the filter must be significantly tilted (much more so than is present when used at the telescope. There is only the darkness of the edge of the field of view when such filters are used telescopically, so your "illusion" seen with the second image is *not* present when viewing with the scope.
Quote: Suppose one sees: 1) red with the OIII with red leak, 2) not red with the OIII without the leak and 3) you do not see anything at all with Ha; what would be the conclusions?
I have looked at M42 using my "Mars" filter (a Wratten #23a equivalent red filter), and while the image was somewhat dim, what I saw was *red* in the nebulosity with *no* other colors present. The brightest red was in the Huygenian region, but the color did extend to some degree away from that area. The filter is not as light efficient as a dedicated H-alpha interference filter, but it does let through H-alpha and did allow me to see clear red coloration in the nebula.
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Re: Is it possible to see the nebula with colour?
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