Re: Astronomik UHC filter?

From: Lawrence Sayre (lsayre_at_neo.rr.com)
Date: 06/18/04 

Date: Fri, 18 Jun 2004 21:35:26 GMT

Martin Brown wrote:
> 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,

I'm in ~mag 4.5 to mag 5 skies at best, with city light polution to the
north and east (making the horizons in these directions far worse than
mag 4.5), and with my best skies to the south and west, and a pretty
good zentih as well. I'm in a mixed rural housing and farming area
about 35 miles south and 20 miles west from two moderately large cities
( the larger of the two is to the north, and the smaller is to the east).

Lawrence Sayre 

-- 
My philosophy, in essence, is the concept of man as
a moral being, with his own happiness as the moral
purpose of his life, with productive achievement as
his noblest activity, and reason as his only absolute.
Ayn Rand (in the appendix to 'Atlas Shrugged')