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Aaron, I've never used a barn door tracker so I can't really give you much help but I would imagine if you can get more than 5 mins accurate tracking with your mount, you're doing OK. Your PA would have to be pretty good for shots that long. Like you said, reverse the polarity on the motor so it rotates the other way and turn the barn door around so the hinges are on the right. Maybe the ones you've seen with the hinges on the left have been made for use north of the equator.
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