No "twenty inch rule" that I know of. View cameras such as a Gavin 6x7 are acceptable, I believe. I have posed 6cm x 7cm images. All images are "posted" -- not quite sure what you mean by that.
What kind of cropping are you talking about? If you mean crops in making a print that has nothing to do with anything. If I expose 4x5 film in a 4x5 camera I've made a large format photograph. It's the size of the film that's relevant, not the size of the final print.
If you're talking about a film holder that crops the 4x5 film in camera, e.g. so that two images can be made on one sheet, that's irrelevant too it seems to me. You put 4x5 film in a 4x5 camera. You made a LF photograph. You put 6x7 film in a 4x5 camera and you've made a medium format photograph. I don't know what's "allowed" and what isn't and I doubt that everyone agrees but I don't see how a 6x7 negative can be considered "large format" regardless of what kind of camera was used to make it.
Brian Ellis
Before you criticize someone, walk a mile in their shoes. That way when you do criticize them you'll be
a mile away and you'll have their shoes.
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