1 star alignment is only accurate if your mount is perfectly aligned, as in setup in an obsrvatory, even then minor mount errors could induce a error in the alignement. Good luck with further testing David, one thing you may find the thing not GOTOing planets properly, this was a common problem with the 2.05 HC although some people have had great success, I guess it depends on if it was made on a wednesday or a friday arvo I guess.
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