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H alpha filters can't be used with reflectors?
Hi Matthew
I don't think you can fit a hydrogen alpha filter to a reflector - neither newt nor cass. I think it has to be a refractor. It's something to do with the way the interference filter works, I can't remember the exact reason.
The double stack 40mm PST gives remarkable views for it's size. I love mine. Being so small, I put a Polarie on a solid camera tripod and the PST on the polarie it takes me 30s to set up and I can start observing. I went for the double stack option - gives much better views.
cheers
Joe
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