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That's a thorough review Roger. My perception of the Astrotrac is the necessity to purchase add-ons to obtain reasonable rigidity. I was put off by the upselling - add this and add that. I did have opportunity to get a close look at the AT polar scope and found that, while the eyepiece end was well made, the objective end is a plastic tube, threaded and held in place by a single grub screw. It appeared that during factory collimation the thread had been mashed and without a collar to stabilise the tube collimation was unreliable. Not consistent with what appears to be, good quality fabrication, otherwise. Richard Taylor was receptive to the feedback, however.
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