RE: [APML] Hutech IDAS LPS Filter Question

[Jerry Lodriguss <lists3@astropix.com>]

All hope is not lost...

If you have mostly sodium vapor light pollution (red sky background at 
night), you can try using a simple Cyan CC filter.

If you have mostly mercury vapor light pollution (green sky background at 
night), you can try using a simple Magenta filter.

Jerry


At 12:07 PM 4/1/2005, you wrote:
> > Thanks Ulrich.  Do you know of a LPS filter
> > the WILL work with a 55mm lens?
>
>Sorry, I don't. And as far as I know, there isn't really anything that
>can compete with an IDAS anyway.
>
>I don't know the exact physics of LPS filters, but as far as I know,
>they all rely on light hitting the filter at a certain angle - maybe
>someone else can tell us more?
>
>Ulrich
>
>_______________________________________________
>Astro-Photo mailing list
>Astro-Photo@seds.org
>http://seds.org/mailman/listinfo/astro-photo


Photoshop for Astrophotographers
http://www.astropix.com/PFA/PFA.HTM










_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo