I used the 32mm Rodenstock here. I could have just barely squeezed this into a single frame with the wider-angle 23mm, except that the 23 doesn’t have a large enough image circle to accommodate the vertical shift needed to keep the vertical lines from converging. The 32 has a much larger image circle, and so stitching with it yields a wider angle of view than I could obtain with the 23 (which allows only much more limited movements). More pixels this way, too.