It is possible to make a 9000 dpi effective DSLR scanner with a Nikkor EL 50mm f/2.8
I was measuring optical performance of an old plain Rodagon 210mm, projecting a USAF 1951 glass slide on the easel with the Durst 138S. I found it resolved Group 7.2 in the projection, it was f/11, in the center, and at x4 enlargement.
This is a crazy deal of resolving power, not bad for lens mostly recovered from trash, $25, with a nice collection of scratches and some balsam separation in the boundaries. This is 143.7 lp/mm on film and 35lp/mm on the paper.
I used a D5100 DSLR to make the measurement, just projecting on the sensor. Y used a D5100 because its back screen can be flipped to focus:
And straight calculation tells that an scanner must resolve 7000 dpi effective to get the same image quality than the DSLR!!!!
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