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Well there's one theory out the window. I'll post an animation later but I took 38 x 5 min shots last night and every one of them except for possible the last half a dozen are useless. I'm starting to think that the mirror is moving. I couldn't get a decent focus at the start of the night, but I got it as close as I could, tightened the focuser as carefully as I could without shifting focus and let it run.
The stars were blobs and moving diagonally, during the night the drift got less, the stars got tighter until at the end with the scope pointing nearly vertical the stars were tight and the drift almost negligible but sideways in dec direction.
Will post animation later. Bit a processing to do to get it ready
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