Interesting thought and certainly it's not line pairs per mm that keeps the 8X10 at my house. The quality that I am unwilling to lose is the brute force aspect. Tonality and depth of focus choices. 16 inch f4 is impossible to duplicate with 4X5. Anybody got an 8 inch f2 lens for me to try? I'll grant you that some of the best of the projection lenses like f2.4 165mm get close on 4X5.
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