[Chaos-l] Narrowband filters?
alexeyt at freeshell.org
Sat Apr 28 19:26:42 EDT 2012
I've been considering getting a narrowband filter (O-III and H-beta). I've
read that they improve contrast when viewing emission nebulae. I have some
questions that I hope folks here can help with:
Can they also be used to improve views of galaxies?
I assume they're not useful for clusters and dark and reflection nebulae,
since most of the interesting light there will be H-alpha?
I've been looking at the Orion UltraBlock, the Lumicon UHC and the TeleVue
Bandmate Nebustar. They are all around the same price (about $100 for 1.25").
I can't tell what the actual pass band is for the TeleVue (I can only find
this info for the other two) does anyone know where I can find it?
Does anyone have experience with these particular filters?
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