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Can the guide chip be used to take a long exposure while the main imaging chip is used for guiding? I still think that if the problem is a slow phenomenon - ie - slower than the guide rate, then it must be occurring in the camera (ir at least after the point where the light to the guider is not passing through the same optics as the imaging ray. Anything else would be corrected by the guider. Otherwise, only something not being sampled by the guider ( ie faster than 1Hz if you are guiding at 1sec) could explain the difference between the guiding performance and the image.
Cheers,
Andrew.
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