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Stuart, there is elongation only on the upper right and lower left of the image at full size. The off center ringing is odd as I have not had this before myself. Finding the sweet spot has been a pain in the butt, but I have had it before with the 40D which has a bigger sensor and I will find it again. My adapter for the flattener is due to arrive from the States next week. This will mean I can sort collimation and have a truely flat field. I might have tightened up the collimation screws a little too much too. Still quite happy with the detail of the head despite some "small" issues.
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