I did some testing with my new, soon to be released, 790mm f:5.4 meniscus lens.
I wanted to verify the bellows draw needed to focus at 3 meters (10') and at 1.5 meters (5').
When focused at infinity the bellows draw is 790mm, as expected.
When focused at 3 meters, the bellows draw is 1000mm.
When focused at 1.5 meters, the bellows draw is 1400mm.
I converted a spare bedroom into a camera obscura for evaluating monster lenses.
Unfortunatly, I can't evaluate the field of view with my set-up.
Tim's post gives some insight on what to expect under similar conditions.
Here's a data sheet on the new lens...