Here is one other viewpoint:
John Fielder wrote in his 1996 book, "Photographing the Landscape, The Art of Seeing" page 134:
"Field cameras fold into a relatively small size for portability, while mono-rails have a central rail upon which all of the parts are mounted. Mono-rail cameras are more flexible than field cameras, but they are also more unwieldy. Mono-rail view cameras are best used inside studios, and field cameras are best for the outdoors."
Bookmarks