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Not sure I can add much to this but I recently added a SXao to my homemade Fork mounted Newt. hoping to improve guiding. The latest version has moved from serial to usb and more power is available to the motors according to SX. If the mount has problems with backlash while calibration is in operation the unit will move beyond its normal limits and 1 of the motors will jam. Only way to unjam is to turn that motor shaft with a tiny screw driver usually having to take it off the scope,not fun in a imaging session.
While I don't have a lot of experience yet my results show that if the seeing is bad it will not help much but if the seeing improves it will keep things very tight with PHD plotting mostly in 1.5 arc sec circle at 2 m fl.
Clear skies Ken.
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