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Wow Eric, what a night. You get top marks for persistence, I would have kicked something, and packed it in way earlier.
If I give you any advice, do these things on a wet/cloudy night, get it all set up, and then just the merest of fine tuning on THE night.
Hard to guess at the problem, but I suspect a combination of slight mis-collimation, (making the stars on one side "better", and coma/field curvature.
In the prvious images you have used the DSI no doubt, but the new toy is the 350D, correct? If so there is a whopping difference in chip size, with all those nasties at the field edge never seen with the smaller DSI chip. Now you have a BIG chip, this shows all those optical snags that you didn't know you had.
I could be wrong though, and there will be plenty to help here.
Gary
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