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I cant comment on the hand controller as I did not buy one, and I have the older 12V powered unit on my Stellarvue. I have no complaints at all about my EAF. It works perfectly well and repeatedly. Backlash seems to be quite small and is easily managed with a couple of hundred steps compensation (Compensating both for the EAF backlash and any in the rack and pinion) If I had kept my SCT I was thinking of replacing the Celestron focus motor with another EAF as the Celestron lacked a temperature sensor.
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