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Yes the really obvious aberration disappears near the zenith. That last photo was taken near the zenith and the focused image taken at the same time did not show the bad aberration that appears in the first photo. Therefore it would seem that the degree of poor collimation indicated here is not responsible for the aberation in the first image.
That said the collimation is clearly off. Also I think I probably over tightened the screws on the primary mirror. I will have a go at fixing both and take another set of test images hopfully tomorrow.
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