Re: [APML] New Prime Focus

["Michael Barlow" <mikeba@rochester.rr.com>]

    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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