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Interestingly I find it's the smaller stars that work better. Big stars have wide peaks and sometimes hollows in the peak which PHD can occasionally misread. I normally select a star that is a bit isolated from the rest to prevent any loss of visibility and reacquiring the star and a smaller one that gives a good sharp peak.
Judging by my results with the ZWO you won't have too many problems and PHD2 just about makes it all automatic anyway. It will also do a good drift align as well.
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