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I'm not an expert imager, but am curious to understand the elongation.
looks like flexure, but could you post some details?
was each sub 5m30, did you use autoguiding, if so what guidescope/camera, did you use phd?
doesn't look like coma as that would be radial.
did you balance the scope, how was your polar alignment?
maybe someone else can ask you specifics more closely related to your elongation, but its good to cover everything else.
can you also post one sub which shows the most movement?
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