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Interesting. Can you post a screen shot of the orthogonality graph with the SSAG, under review calibration? How many calibration steps in the RA axis?
I had similar issues with my guiding (large errors in RA, RMS over 1.5" at times), so I am tinkering with the mechanical side of the mount to see if I can fix it (worm meshing and adjusting for back lash etc).
Bo
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