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You need a really dark sky site, a night of good transparency, at least a 10" scope, an excellent EP and the correct filter. While the H Beta is ideal a UHC filter also makes it easier to see.
I've seen it three times, twice in a 14" and once in a 25" but only when all the above factors were present. It's detectable as an area of darker sky against the very faint nebulosity.
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