Ok I've taken a different approach on this one for the processing. I think I like it better....but then maybe not. Maybe a combination of the two....if i could remember what I did. Time to turn on the log option in PS me thinks.
WO 72 FD with WO III 0.8 FR and Flattener. There is rotation at the corners, probably from guiding outside the image area. Similar images of another object doesn't show the elongated stars. Something to work on when I have a FR of my own. (Thanks Troy for the lend
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Details:
Canon 20D (modded)
10 shots @ ISO 800 @ 360 sec
ICNR
No Flats so slightly cropped (one side only
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Aligned and Average combined in IP
Post processed in PS CS3. Basic levels, Curves, and contrast enhancement actions.