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First, I assume you meanusing the eyepiece filter IN CONJUCTION with the Baader film... if not, well, I'm certain you'll get a lecture or two in short order.
As for your idea... You'll never get the narrow band required to see any detail. The reason etalons are pricey is that they allow tuning within a very narrow band (generally less than 1 angstrom).
Baader filters would be in the 350 angstrom range. Much to broad for any detail (if you are comparing it to a Coronado).
OIC!
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