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Hi Tony.
Here is a good way to check if its field curviture or if its focuser tilt.
If you rotate your camera 180 deg without disturbing how the camera is seated... ie. With a rotator...and the effected stars stay in the same place on the image download, then you have camera tilt. If however the effected stars don't follow, then its field curviture or collimation etc.
HTH
Josh.
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