When did I say that? I never said I couldn't tell the difference, just that a cell phone can make a perfectly good 16x20.
I just got three 16x20 digital C prints made. Like all C prints, they don't resolve needle-thin detail like inkjet prints do. Looking at the file and the prints side-by-side, I figure I'm getting about 150 DPI from the prints. 16x20" at 150 DPI is 2400x3000, or 7.2 Megapixels.
There are plenty of 8 MP cell phones out there, and some even higher.
Could I tell the difference between the 16x20 from the cell phone vs 4x5? Obviously, but sharpness-wise, they'll be comparable.
I'm just saying, any entry-level DSLR will give you a nice looking 16x20 C-print. If that's the largest you need to go, you don't need to be using LF for its resolution.
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