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From my experience, the removal of the filter improves the take up at the red end of the spectrum but it does not affect the other end. Processing is as per normal, they show up as red because it's there. Typically the nebula targets are heavy in Ha anyway, which sits down at that end of the spectrum. There is no need to boost saturation, it was always there, you just could not pick it up before because the LP2 filter blocked it.
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