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Type of error
Dear Dennis - I think what you have in that picture is some kind of shift between the guide scope and the imager. Is that possible with your set up?
All the stars have the same offset angle from their original positions so in my book that isn't field rotation. If it were we should see a rotation of the images as if there were a pin in a middle of the frame and one image had been rotated slightly with respect to the other.
I hope you see where I'm coming from.
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