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Raymo,, that's still a reasonable result. You must tell everyone you're using a Nano Tracker on a tripod now and we will be even more impressed!
The movement may be the camera connection at the ballhead. I have found if I'm shooting an object to the west of the meridian, the weight of the heavier longer focal length lens will actually loosen the screw connection as it is weighted anti clockwise on the thread.
You must make sure that connection is tight because if not, the camera will move during the exposure and cause star trailing.
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