After the precision I'm getting with the Vixen polar scope, the iOptron's looks a little primitive in the way it's inserted. It's probably OK though. The Vixen is machined to fit precisely via a series of machined conical surfaces, and is drawn in to position by magnets. It's really exceptional quality. I guess that the old adage survives, you get what you pay for. I'd be interested how accurate the iOptron's tracking performance was in comparison to the Polarie.
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