Re: [APML] The Other Double Cluster

["Chris Schur" <cschur@cybertrails.com>]

Axel, its called the half moon was near by.  I think the sky is plenty dark
for cluster photography during the moon periods, but the gradients are a
challenge to fully remove.

Chris
----- Original Message -----
From: Axel Mellinger <axm2@canopus.physik.uni-potsdam.de>
To: <astro-photo@seds.org>
Sent: Sunday, March 16, 2003 1:58 AM
Subject: Re: [APML] The Other Double Cluster


> On Sat, 15 Mar 2003, Chris Schur wrote:
>
> > The Pair M46 - M47 smiled at me for this new Supra image with the
schmidt.
> >
> > http://www.psiaz.com/schur/astro/filmimagepages/m46-m47.html
>
> Chris,
>
> beautiful star field! This is a lovely pair of clusters.
>
> While looking at your image, I noticed a subtle color gradient (a reddish
> band at the bottom of the image). Did you use any anti-vignetting
> technique on your image? Some of my recent Supra 400 and PJ 400 negatives
> also showed some banding (probably due to the less than ideal processing
> conditions out in the desert), which was easily removed by subtracting an
> unsharp mask.
>
> Clear skies,
>
> Axel
>
>
> --
> Axel Mellinger  <http://canopus.physik.uni-potsdam.de/~axm/astrophot.html>
>
>
>
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