Yep, 8x20 Canham, here are some details...
The lens was pre-mounted on a 8.5" square board and clamped to the front posts of my KB Canham 8x20" camera. The Gazebo was 75' (23 meters) away in late morning sunlight. Focusing wide open was very fast on the sunlit vertical fence, no re-focusing was done for each aperture card. I let the inherent depth of focus for this lens express itself at each aperture without tweaking it each time. (I felt it was "right on" at each f:stop).
The Paper Negatives are on 8x20" PhotoWarehouse VC RC paper, (pre flashed 3 seconds @f:32)
Exposures were ±1.5 seconds @ f:6.7, and 6 seconds @ f:22 (using a cardboard version of Ansel's hat)
Developed 7.5 & 14 minutes in old, used Ansco 130, diluted 1+15.
The central 8x12" area was scanned (Epson V700); levels adjusted a bit , but NO sharpening.
I'd love to try the same test with portraits, but my bellows draw is wayyyy too short.
Here's how I mounted ont the camera: