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Peter,
The 1mm error corresponds to 0.5mm displacement of the chip. Considering how some of these cameras are made, I would not expect the centering to be better than 0.25mm.
I pulled apart my old QHY8 at one stage to correct the tilt of the chip, not worrying about the centering, and I was disappointed by the methods used for mounting it. The housing was made to high accuracy, which should have allowed the mounting of the sensor in an accurate manner. Instead the position of the sensor was determined by the PCB and the PCB was quite distorted by all the insulating materials that were jammed underneath it.
Another issue with these sensors, that I don't really understand, it that they seem to have more pixels than what is actually being used - at least some of the sensors that I have looked at. If that is the case then maybe the physical center of the chip is not the same as the optical center?
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