Just been having a discussion with someone about whether it's 4x5 or 5x4. They thought it was 4x5 only in the US and 5x4 everywhere else. I said in my experience, with the exception of a handful of older large format shooters I've met, it's all 4x5.
How did the naming come to differ? Anyone any ideas? Do the poms only shoot portrait?
My last Ilford catalogue lists 4"x5" film. My last Kodak catalogue lists 10.2cm x 12.7cm film and is resolutely metric throughout with no mention of inch sizes.
But the actual film is neither of those sizes from both makers. I measure it to be 10.0cm X 12.53cm!
Finally, the international convention for describing the size of art objects insists the vertical dimension in centimetres is given first and the horizontal dimension in centimetres is second. So 10.2cm x 12.7cm is landscape format and 12.7cm x 10.2cm is portrait.