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Hi Alan,
I use a UHCS which I quite like. Stars have a tendency to go a slightly bluish green colour but that wouldnt matter with black and white.
If you stack the UHCS filter with a red then you would mainly select the Ha (so Baader say), but probably not as good as a dedicated filter. Looking at the transmission curves for each though I would think it might work pretty well.
Cheers
David
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