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I want one of those middle year Lumicon O3's!!!!!

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Well, the Astronomik UHC (bought by me in Germany, but given the dollar rate actually cheaper from OPT these days! I guess that price won't stay the same once they run out of stock...) has an H-alpha passband - no leak, but a specific band for H-alpha passthrough.

So has the Baader "UHC-S", but that's a bit of a misnomer -- the pass band around OIII/H-beta on the Baader is closer to that of a broadband filter than all other "UHC" filters from others.

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400mm f/4.46 David Lukehurst truss Dobsonian on Tom Osypowski equatorial platform
Orion Starblast (114mm f/4 reflector, Alt/Az)

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