Here is what I see with my camera. Warning... my poor drawing skills are very evident.
Chip Not Centered.jpg
So...how are you judging this? There IS a matter of perspective here. The AR window is set in front of the sensor by 6.5mm, so a bit over half a centimeter. That means that, if you look at the sensor from the front of the camera, the position of the sensor is going to shift depending on the angle of your head to the window and sensor.
Unless you somehow manage to get your head EXACTLY centered directly over the center of the window, then it is likely that the sensor will appear to be off-center in one direction or another.
A simple way to minimize this error is to put the camera at a distance, so that the distance between you and the camera is much greater than the distance between the sensor and the AR window. Then, even though there will still be a bit of parallax, it should be tiny... I'd be curious to know if you still think the sensor is off-center in this case.
That said, lets say the sensor is off of center a bit. Hmm, as long as it is FLAT to the image planer, then it being off center should not actually affect the shape of your stars much. Decenter may affect how shading (vignetting) distributes across the sensors, and in the extreme periphery you may notice some increased aberrations where diffraction at the corners of the window might affect those stars. But as long as the sensor is flat, it should just affect shading over most of the sensor, and your stars should otherwise be round.
If you are actually having star shape issues, then I would assume that you have tilt or collimation issues somewhere, rather than decentering.
Edited by Jon Rista, 22 July 2019 - 06:40 PM.