RE: [APML] Light pollution filters and Comet NEAT

["Greg Hartke" <ghartke@adelphia.net>]

Hi, Jeff,

I'm not so sure this is correct.

The IDAS LPS filter is a very different animal than the usual light
pollution filters. It has relatively narrow stopbands at the frequency of
selected spectral lines which appear in prevalent public lighting. Because
the cometary spectrum really is farily broadband, most of the light from the
comet will make it through. Of course there will be attenuation but it would
normally be expected to be significantly less than that of the narrowband
pollution sources.

I would expect the IDAS LPS filter to be very much worth trying for this
application.

Greg Hartke
Sykesville, MD

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Jeff Ball
Sent: Tuesday, May 18, 2004 11:45 AM
To: 'Discussion of Film Astrophotography'
Subject: RE: [APML] Light pollution filters and Comet NEAT

Steve,
Without looking at the specific spectral cutoffs of the LPR filter, my
guess is that you would significantly reduce the signal from the comet
as it probably has a pretty broad spectrum of light, similar to
galaxies.  I wish I had been out imaging, socked in with a nice low
pressure system that is stagnant.  Best wishes.

Best regards,
Jeff Ball
www.astro-photography.com


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of steve banbury
Sent: Tuesday, May 18, 2004 11:23 AM
To: Discussion of Film Astrophotography
Subject: [APML] Light pollution filters and Comet NEAT


I posed this question over the weekend, but  everyone with clear skies
was probably out imaging.
I'm interested in shooting Comet Neat from my SF Bay Area location, and
wonder if a Hutech
IDAS filter will attenuate the comet in addition to the local light
pollution.

Yes, I could try with and without, but the Bay Area has been plagued
with marine fog for over a week.
I'll be lucky to get 10 minutes of holes in the clouds!

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


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.681 / Virus Database: 443 - Release Date: 5/10/2004


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


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