Chuck:
1) Old Canon swapped out for new one. Confirmed scripted image acquisition. Lens and dome have been cleaned of significant dust, insect parts and other goobers.
2) Lens zoom on old camera was slightly offset from its widest setting. I reset the zoom for widest FOV. We may need to recalibrate the plate scale. I was very careful not to touch focus.
3) I did my best to reset the orientation of the new camera to where the old one was. No doubt the position of zenith will have moved and will need recalibrating.
Chris:
Not only has the flat-field changed, so has the plate scale/sky coverage.