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Brendan,
personally, I think the DGM Optics NPB is the best overall filter I have, including the usual UHC types. These used to cost around $75 from Omega Optical for 1.25". Not sure how much they are now. You'd have to import it yourself.
It does a better job on most nebulae than any UHC or UHC-S filter I've tried. eg Orion M42, Eta Carinae, Tarantula nebula, etc. No good for Horse Head Nebula, but neither is a UHC filter,
Cheers
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