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Unless the Astrotracer can actually rotate the sensor (I assume not) it will not be able to avoid some trailing of stars in the corners due to field rotation. I would assume that the sensor can move in X and Y side to side and up and down to track the sky, but not by rotating it about its centre.
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The sensor does rotate but the sky does not rotate about the same axis unless you have the camera centered on the SCP. Were it simply X-Y, the stars would rotate about the centre with longest trails at the edges. The trails at the edges are longest but the trails radiate outward from centre not rotate about the centre.
The processor probably calculates how to minimize movement over the whole field. It doesn't replace a good AP set up. Probably more as a replacement for what a Polarie or SW Star Adventurer might be used for.
It is good for someone like Jimmy that is starting out or if you are traveling in the northern hemisphere and want to do some widefield work, or a quick grab while travelling by car in a remote setting.
At any rate it is very unlikely to be causing the problem Jimmy reported.
Joe