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Andrew and all,
Huge thanks for that - was puzzling me! On the second part of the question then - should or shouldn't I be concerned (is a correction needed) because the doughnut isn't over the bright star.
Asked another way - if I dead centre Jupiter on the CCD - take a 1 minute shot and the doughnut doesn't exactly centre on Jupiter does that mean the something isn't exactly square to the CCD?
Mind you if its the LPS - maybe I don't have to worry!
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