Quote:
Originally Posted by Bassnut
in bortle 4.5 skies, 3nm will offer more contrast, which might matter in your case, more pop..
For Ha though, a 5-7nm filter might be preferable, it will pass NII, which for many objects will give more signal.
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That's interesting about the Ha Fred - never considered having a too narrow pass. Something to look into.
Cheers,
Mark