I would imagine that a Achromat could also work well for Ha imaging. And would be a less expensive way to get a large Scope and great images, that work work well regardless of the Moon phase. AlanP
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Officina Stellare Veloce 200mm f/3 Riccardi Honders, AT10RC at f/5.4, Vixen DED 108SS f/5 Refractor, AP1200GTO Mount, ATS Tripod, 8' ExploraDome. AP Mach1 Mount, AP Eagle Tripod at Cottage SkyShed POD. Cottage Scopes; GSO 12" carbon fiber tube RC at f/6.05, Officina Stellare Veloce 200mm F/3 Riccardi Honders, AT8RC, ARO 150mm f10 Mak, Orion Optics UK OMC140DL Mak, (3) Celestron C5 f/6 SCTs. Cameras: (2) SBig ST-4000XCM, SBig ST-4000XM [mono], SBig STL-4020M, QSI 540wsg-8, QSI 683ws-8, QSI 583wsg, Apogee Alta U8300M, Atik 450C, Starlight Xpress SXV_M8C on C6 SCT Hyperstar. Webpage: Mystarrynight[dot]Info