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I had been running 10 min subs, and no noticeable elongation at all, so I am ASSUMING the 20 mins are possibly PE as you mention. This Vixen is so precise that PHD makes miniscule corrections (so much so the mount is almost silent, unlike the NEQ6 I had that was forever being adjusted with PHD). In fact, the PE logging is also tedious, as the star barely moves (hey, not complaining! 37 minutes with non-noticeable movement is pretty darned good in my opinion)
This elongation is apparent across the field, so to me that's either slight PE or some camera tilt (though would expect it worse on the left than right if camera tilt)
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