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In Dave Trott's original article in February 1988 Sky & Telescope, p213, he shows the comparative drive error between the single and double arm barndoor designs.
For the single arm after 40 mins, the error is roughly 40 arc sec whereas for the double arm it's about 5 arc sec. I think this is a very good result.
IMHO I think polar error in set up would probably be the greatest potential error risk.
Last edited by Merlin66; 08-03-2018 at 09:05 AM.
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