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Hi Sean,
Andrews has them for around $69 although I think I got mine from bintel for the same price at SPSP.
Seems to do the job. Not as narrow as the Baader which is more selectively O3. This GSO one is apparently H-beta and OIII. Guess it depends on whether it matters. This shot was taken yesterday with moon pretty close and gibbous. i'd say very good for visual and nothing wrong with the filter.
Cheers
David
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