Stumbled across this remark in the Stargazers Lounge from member Jim...
Three star alignments with SynScan are a bit unusual in that they are not like other systems' routines.See the full thread for more information.
With most systems, the third star enhances the night sky model. With SynScan, the alignment routine uses the third star to correct for cone error. If you have a well-constructed setup, with the optical axis and rotational axis not divergent, then the third star in the mix can make the pointing on GOTO less accurate than a two star alignment; the system might be trying to cure a problem that does not exist.
I've had to stop doing 3 star alignments, since my setup has little or no cone error so the correction of the non-problem introduces error.
The Sky-Watcher SynScan alignment is very unique. Different that Celestron. And therefore they should not be treated the same!
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