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Hi Aidan, I had the same problem, which I thought was a tracking problem, but the elongation didn't get any worse with longer exposures.
Turned out that the camera wasn't precisely perpendicular to the light
path. Took the camera off, put it back on, problem gone. If you are
getting elongation after only 2 secs, it's not going to be a tracking problem unless the motor is not running, or running very slowly.
raymo
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