That's a very wide lens for 16x20.
Some of his work:
https://www.pgi.ac/en/artists/697/
Silver Photographers Never Die, They're Just Getting Fixed
My Stuff: https://www.tundraware.com/Photography
Reference Material: https://photoarchive.tundraware.com/
From his darkroom video
https://www.youtube.com/watch?v=aoDAGrJr9XI
looks like he is contacting printing on 20x24.
A good rule of thumb for doubling a linear dimension (10" -> 20") is that the weight will increase by a factor of 8. As will the price.
If it is an 11x14 with a 16x20 back then the increase may be ~(14/10)^3 = 2.7 for the camera and 8 for the back.
Which makes a good case for an 11x14 w/ 16x20 back if you want to pick the camera up and put it on a tripod.
Darkroom Automation / Cleveland Engineering Design, LLC
f-Stop Timers & Enlarging meters http://www.darkroomautomation.com/da-main.htm
Also interesting to note that he uses the venerable Elwood 8x10 as his light source for contact printing and, as far as I can tell, for his modest (17x21) enlargements as well. Another thing that caught my attention (and makes me smile) is that he started using the 16x20 relatively late in his career -- he is no spring chicken! -- and says that it re-energized him (after the 8x10). He seems to be relatively undeterred by what some of us might call challenging weather and lighting conditions and the unwieldy nature of ULF.
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