light-pollution filters

Andrew Pierce (pierce@No-Spam)
Thu, 27 Apr 1999 14:21:45 -0700

I find the Ultrablock is too strong for galaxies, at least at single digit
apertures. Galaxies radiate at many wavelengths. The narrow band filter
reduces light pollution, which helps some.

----- Original Message -----
From: "M. Wagner" <resource@No-Spam-intl.com>
To: "'TAC'" <sf-bay-tac@No-Spam>
Sent: Thursday, April 27, 1999 2:01 PM
Subject: light-pollution filters

> On Thu, 27 Apr 1999, Randy Muller wrote:
>
> >
> > I opted for the Ultrablock to cope with my mag 4.5 backyard sky, but
have
> > since realized it's useful for a lot more than just this. It does best
on
> > emmission nebulae, especially planetaries.
> >
>
> That's interesting Randy. I have a 1.25" Orion Ultrablock and a 2"
> Lumicon UHC (as well as a 2" Lumicon Skyglow). Do you find the Ultrablock
> helps galaxies in town? I've never tried that.
>
> Mark Wagner
> mgw@No-Spam-intl.com
>
>


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