Thanks Guys, interesting responses - some expected and some unexpected. Nice to hear what everyone else uses for a guide.
every one of you has it all wrong. let me shed some light...
4x5 - sub mini format
5x7 - mini format
8x10, 7x11, 10x12, 11x14 - small format
4x10, 5x12, 7x17, 8x20 - anorexic format
14x17, 12x20, 16x20 - medium format
20x24 - large format
its so simple.
Yeah, I'd think of 2x3" and 3x4" as medium format sheet film formats. 35mm is still miniature format, even if it's used in a monorail view camera--
I think the more appropriate measurement is by pain.
Large format = moderate lower back pain when hiking more than 1 mile roundtrip.
ULF = a crippling inablility to move the next morning after a 1 mile hike.
Some days I shoot LF, some days it feels like ULF. :)
An interesting survey from Mamutphoto a while ago...
Tiny (35mm and medium format) : 11 - 10%
Small (4x5 to 8x10) : 66 - 60%
Panoramic (5x12, 7x17, 8x20) : 11 - 10%
Medium (11x14, 12x20) : 10 - 9.1%
Large (14x17, 16x20) : 9 - 8.2%
Mamut (18x22, 20x24) : 3 - 2.7%
On further reflection, ULF seems to begin at about the spot my wallet ends....
I think I once posted that "ULF" is what you say when you realize you've just bought a very large camera, and you realize you need more darkroom space, and more storage space for the negs and proofs, and you can't make small proof prints, and you need a bigger lightbox, and even your garbage can isn't big enough for the rejects.