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Thanks guys.
Stuart I am using an EM400. However, I am sure I don't have flexure. However there is something going on with the way I have the camera squared to optical path. Possibly even that final touch of collimation.
In the images below you can see that center top left and bottom right are all circular but top right and bottom left are definitely elongated. Well at least that is what I am thinking. Can you see what I am talking about? Personally I reckon it needs to go just a little to the right with the collimation.
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