Hi Michael,
I'd say it's a combination of sky fog and
vignetting from my 3" achromat.
Gary
----- Original Message -----
Sent: Wednesday, February 23, 2005 7:37
AM
Subject: Re: [APML] New Prime Focus
On the outer edges the sky is dark and it
gets lighter as you go towards
the center. Am I right in assuming
this is "sky fog"? I have the same
effect on some of my longer M31
prints but it's not as apparent, or non
existent in my shorter M42
prints.
Michael A. Barlow
----- Original Message -----
From:
"GARY HATFIELD" <Starmangmh@msn.com>
To: "Discussion
of Film Astrophotography" <astro-photo@seds.org>
Sent:
Tuesday, February 22, 2005 11:14 PM
Subject: Re: [APML] New Prime
Focus
Hi Alan,
Thanks! Yes, I will
probably get an autoguider in the future but first
I need a decent scope
for AP. My little 3" Stellarvue is a wonderful little
scope for
visual use but doesn't lend itself well for long exposure film
shots.
To illustrate what I have to deal with, here's a jpeg of the raw,
untouched
2400dpi scan...
http://www.starryestateobservatory.com/My_Homepage_Files/Page98.html<http://www.starryestateobservatory.com/My_Homepage_Files/Page98.html>
Also,
I think my focus was a little off. The softness of the finished
image
was induced by me using SGBNR. After all the vignetting
correction and
stretching the image was very chunky looking so I kinda went
overboard on
the smoothing. I definitely still have a lot to learn
about processing.
And yes, the brown background stuff is really
there. That was one of the
things I was trying to bring out that
resulted in the chunkiness. Even
though this isn't a great image, it
will give me something to work on for
future
images.
Gary
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