Quote: Everything might be... However how *strong* is that H-alpha emission? Could one see anything there with a H-alpha filter?
Maybe, if the observer's eye was sensitive enough (otherwise, probably not). I have only seen the typical bluish-green color in my 10 inch (but 36 inches is a lot of aperture).
Quote: Whichever Nebula will have "some" amount of H-alpha emission (including the ears of M27), the point is how faint? is that enough?. The fact is that 1353 is (as far as I know) by large dominated by OIII; add that the eye is 10 times more sensitive to OIII than H-alpha....
The dominant lines in NGC 1535 are the OIII lines and H-alpha line. The H-alpha line is significantly weaker than the 5007 angstrom OIII line (the very strongest line in the planetary's spectrum) but is about the same strength as the 4959 angstrom OIII line and over twice as strong as the H-Beta line.
Quote: In my opinion you are trying to keep alive a dead theory.
What "dead theory" are you talking about? All I have maintained here is that reddish hues are visible in certain bright emission nebulae (and even in a few planetary nebulae) under the right conditions. You seem to want to deny that reddish hues in nebulae can ever be seen at all, which is an unrealistic viewpoint. This is an argument for the sake of an argument, and is thus a waste of time.
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Re: Is it possible to see the nebula with colour?
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