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Hi,
Will be interesting to hear what others have to say,
is the elongation along E-W or in the same direction in the main scope as the stars would drift if you had turned tracking off?
To me, it looks more like tracking errors even though you have stars centred possibly due to the longer focal length of your main scope compared to the finder guider?
I know phd is capable of sub pixel guiding so even if the movement of the star is a lot less through your guidescope/guidecam, can it be significant enough in your main scope?
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