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Paul - I'd go for Astrodon or Custom Scientific... I've got a set of 5nm custom scientific NB filters coming shortly... Its very much a game of you get what you pay for when it comes to filters... Baader LRGB filters are actually quite good... but for narrowband I went for the best I could afford... and as narrow as I thought my exposure duration could manage... with your mount, don't be affraid to go for a 3nm Ha filter!
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