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Hi Monte
Yes - I was wondering that myself when I was processing the 50 frames spanning 2 hours. The stars appeared acceptably round in each frame, so initially I figured it may not be shift or flexure, as I understand those fault modes tend to produce trailed stars?
However, at an imaging focal length of 918mm and 2 minute sub-frames, maybe the flexure or shift is below a certain threshold?
This auto guiding is not as easy as it appears eh!
Cheers
Dennis
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