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RE: [APML] Sword in the mist - my deepest yet
Alan and Stuart, the reds are caused by halation of the red layer. Supra
has an abundance of red sensitivity so all stars no matter what brightness
have a red halo around them. Reducing the saturation makes it less obvious,
but turns down the rich reds of the nebulosity as well. other than manually
desaturating all the rings around all the stars (Egad!), there is not too
much we can do!
Chris
-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Alan Voetsch
Sent: Sunday, January 02, 2005 1:57 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Sword in the mist - my deepest yet
Hey Chris,
--- Chris Schur <cschur@therim.com> wrote:
> http://www.schursastrophotography.com/filmimagepages/sword1.html
That certainly is deep, wonderful acquistion. Can you explain the red
rings around the stars? Is that from 'pumping up' the reds? I see that
on many of my shots and want to know how to get rid of them. I suppose
other candidate causes could be; focus shift or optics out of
collimation.
Alan
=====
SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102
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