Quote: The test must be made with a Ha alpha filter. It might be that the OIII with read leak passes the star field lights in a different way that without the leak (thus color constancy effects work differently). Given the examples that one can see red through a OIII filter without the red leak, who can say what happens in those critical condition.
The only difference between the OIII with the red passband and the one without *is the existance of that red passband*. Otherwise, the primary OIII passbands were very nearly identical. Similarly, the H-Beta filter I used has a similar deep-red passband that passes H-alpha at a very high level of transmission as well as the weaker H-Beta line). Red was seen in M42 with that filter but not with any of the filters that did not have red passbands (such as my newer 2" Lumicon OIII filter). Again, why can't you understand this??
Quote: You are so convinced that "every color must be real" that you prefer to question the colors of a photo (nor you point any other photo).
I have NEVER said that "every color must be real". Why do you keep distorting what I (and others) are saying here?? Is your position so weak as to make you unable to discuss things instead of distorting them?? I don't "prefer" to question the colors of images, but I do *point out* that, unless they are done quite carefully to reflect a visual response analog (like David Malin has done), they often may not accurately represent the color detail which may be seen visually. I don't know about the colors seen in NGC 1535, but I do know about those which have been seen in the objects which I specifically mention and that others have observed in large instruments or when using filters. Now please quit distorting what I am saying!
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Re: Is it possible to see the nebula with colour?
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