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Gday Hans
They dont mention anything re encoders and "appear" to quote the PE as around +/-2 arcsecs. Also max speed is only about 6deg/sec.
As such, i suspect they merely count microsteps to control position, vs the Chronos that uses precision encoders and massively more powerful/faster motors.
( If only counting microsteps, they cant account for errors in the gearing )
Ya get what you pay for, but they do look an interesting mid point.
Andrew
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