Re: [APML]: PJM limits

["Mike Regish" <mregish@map.com>]

The Pleiades is reflection. Reflection nebulae are blue and emission nebulae
are red.

I'm surprised you got good results on th Plieades as most people say it
won't help. I haven't tried either myself.

Mike Regish
http://members.tripod.com/~mike534
mregish@map.com
-----Original Message-----
From: Wil Milan <wmilan@airdigital.com>
To: astro-photo@nightsky.com <astro-photo@nightsky.com>
Date: Thursday, February 05, 1998 7:39 PM
Subject: Re: [APML]: PJM limits


>
>Mike Regish wrote:
>
>> I don't think the deep sky filter will help you with reflection nebulae.
I'm
>> pretty sure it's only good for emission nebulae.
>
>I've had fairly good results on long exposures of emission nebulae (such as
the
>Pleiades nebulosity) with a Deep Sky filter. As long as the filter
selectively
>reduces the background sky glow it allows longer exposures, which increases
the
>contrast of the nebula against the background sky.
>
>Wil M.
>--
>"When I consider your heavens, the work of your fingers, the moon and the
stars
>which You have set in place, what is Man that you are mindful of him, or
the son
>of Man that you care for him?"  -- Psalm 8
>
>
>