[Chaos-l] Narrowband filters ?

[Allen Davis]

Imho lumicon filters are the best.
Connected by DROID on Verizon Wireless

-----Original message-----
From: Alexey Toptygin <alexeyt at freeshell.org>
To: CHAOS <chaos-l at rtpnet.org>
Sent: Sat, Apr 28, 2012 23:26:42 GMT+00:00
Subject: [Chaos-l] Narrowband filters?


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?

 			Alexey
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