Somebody asked about the quality of stitching with a TS-E lens.
Here is an example, done with a TS-E fully shifted in both directions.
I had to take 3 frames (one with the lens centered) to do the
complete coverage. There were taken with a TS-E 45mm F2.8.
The aspect ratio is slightly more than 3x.
See if you can spot the seams (there are 2).
then look at this image:
The images were aligned by hand using photoshop.