Therefore, "normal focal lengths" are defined by the standard print
size and viewing distance,
But what is a standard print size? Is it 8x10, as once was said? I don't
know anyone that makes that size now. How about 2, 3, or 4R? That was
standard in the fifties. Perhaps it should relate to the screen on an
iphone, or an average monitor size today.
The term normal has too many implications. I think the older term standard
lens means more or less as you prefer. The very idea of normal for a lens
isn't really productive, it doesn't mean a thing.
--
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