What I was saying Fred was that after the change over of guidescopes and mounting I shot 5 min of Cent A. The result was that I had the same amount and direction of movement as previous. Then due to cloud I swung over to M46 to see if I had the same problem on the opposite side of the meridian at around a similar altitude. I took 2 x 5 min shots. Both shots had perfectly round stars and the mount didn't move between the shots (ie hardly a pixel movement between shots). I then slewed back to Cent A and managed 1 x 5 min shot before the clouds moved in. The stars showed as round, no movement between the shots.
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