Let's say a scanner has only one sensor, and only one lens. Like my Epson 4990.
When you scan a negative - and specify a resolution that is less than the maximum - doesn't the scanner just scan at max resolution (the only one it can), and discard the extra data ?
On my Epson 4990, I have seen little difference between a 600 ppi scan upsized to 4800 ppi in Photoshop, and an explicit 4800 ppi scan.
I know that the 4990 is really able to deliver something like 2400 ppi at best.
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