Re: [APML] Hutech IDAS LPS Filter Question

Thanks Ernie, if I can get a clear night I'm going to do some testing, moon or not.

Gary

----- Original Message -----

From: emastroianni

To: 'Discussion of Film Astrophotography'

Sent: Sunday, June 12, 2005 9:27 PM

Subject: RE: [APML] Hutech IDAS LPS Filter Question

Gary,

I own a couple of IDAS filters, and my understanding is that they block
the transmission of selected wavelengths of light pollution "noise", but
admit as much natural light of the visible spectrum as possible.

If you use one during moonlit nights, you'll still block the light
pollution noise, but it will have no effect on the moonlight, which is
reflected natural light of the visible spectrum.

So an IDAS filter may present some advantage if you are making time
exposures on nights when the moon is not yet full, but, at some point,
the growing moon will swamp the light pollution and the IDAS filter will
have little effect.

Ernie Mastroianni
Milwaukee, Wis.

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of GARY HATFIELD
Sent: Saturday, June 11, 2005 4:23 PM
To: APML
Subject: [APML] Hutech IDAS LPS Filter Question

Hello,
My filter arrived today. I opted for the 48mm and a step-down ring
for my 105mm Nikon lens. I went with the 48mm so I can use it for prime
focus in my Lumicon Easy Guider. I realize I will probably get some
vignetting but I think the scope needs the filter worse than the lens.
My question is to those of you using this filter. How does it do in
combating Moon glow. Since we've had crap weather for several weeks and
the forecast is the same for the next week, I (hopefully) will be
testing it in the next couple of weeks. Just wondering if it will be
worth my time to give it a run with moonglow present (provided I even
get a clear night)?

Thanks in advance!

Gary

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