Re: Astronomik UHC filter?

From: Martin Brown (|||newspam|||_at_nezumi.demon.co.uk)
Date: 06/18/04 

Date: Fri, 18 Jun 2004 07:47:29 +0100

In message <hPrAc.47287$Oa7.18308@fe1.columbus.rr.com>, Lawrence Sayre
<lsayre@neo.rr.com> writes
>OK, the consensus regarding the Sirius NEB1 filter was that it is less
>than great, so now I'm asking for comments on the Astronomik UHC
>narrowband nebula filter vs. the likes of the Lumicon UHC and the Orion
>Ultrablock.

What sort and level of light pollution are you observing under? The
optimum filter depends on the ambient conditions as well as not being
entirely objective. I prefer the Orion Ultrablock on price and for its
minimal light leak at the red end under HPS lighting YMMV.

Under mercury lighting the result would be different.

Regards, 

-- 
Martin Brown