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i don't really understand the problem. If you think Ha is too strong (or "unnatural") in the red signal, then capture RGB and 3nm Ha separately. Subtract (say in PS) Ha from the red signal and then blend in the separate Ha channel to taste (if at all). I must say though, a nebula pic without Ha at all would be boring AF regardless of how much it conforms to an "a realistic human eye response experience"
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