So, by your definition, 2 1/4 x 3 1/4 sheet film, and 3 1/4 x 4 1/4 sheet film are not Large Format at all but medium-format, even though they are sheet-film?
Hmm - actually, I'd buy that - though the 3.25x4.25 is pushing it a bit. However, I still find walter's definition to be a bit arbitrary. Seems to me that's it's just a personal opinion, not a definition.
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