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Gary, I have noticed little or no difference in collimation from the horizontal to the imagined object with regard to collimation. This I suppose is particular to SCT's which are less susceptible to issues relating to flexure of the tube. The shorter tube has its benefits in this regard. That said collimation should not be undertaken when the scope is in direct sunlight. The tube currents will destroy the likelyhood of getting good collimation with the day star.
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