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Hmmm, quite plausible Colin but hard to tell. I do note that the image angle reported in the fits headers of the pre and post meridian flipped images shows that the change was 179.49 degrees rather than 180. I am assuming that this is due mount mechanical issues and probably a red herring. It could explain why the two images appear to rotate around a centroid in the corner.
Nevertheless, my working theory at the moment is that there is a small collimation issue combined with some tilt. I will do some more work on this to see if I can confirm this. I am preparing myself for the possibility that the OTA may have to be sent to Tak for service. If this is necessary I will be asking some more questions as I have now idea how one goes about that.
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