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I've conducted a rotation test by taking a 60 second image, rotating the camera about 90d and then taking another 60 second image. Guiding was operating fine at the time.
Attached is a zoomed in annotated screenshot of the stars in the centre plus a copy of the CCDI curve plot. Whilst the elongation in the stars is only small it is definitely there and definitely moves with the rotation. This indicates that the issue lies with the OTA which is what I was suspecting.
So the main question here is whether I will really need to do something about it as the aberrations may be such that they don't show up in the final processing. I'm going to finish the data capture on my current object and see how it lands.
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