I read where a process lens is optimized for 1:1 photography with a likely aperture setting of f22. At this magnification, the subject matter is about two focal lengths away from the lens.
I'm wondering, how many focal lengths away must be the subject matter, before a standard lens (versus a process lens) will get effectively the same result?
Put another way, at what magnification does a process lens become advantageous, versus a standard lens?
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