A long time back C.H.Ling shared on list some of his comparisons of film
scanner vs microphotographs of the film.
This is is essentially the same, but is done at 2400dpi and 4000dpi, so gives
an idea of what is lost at different scanner resolutions. Remember that film
scanners have nominally a lot better resolution and lower artifacts than digi
cameras, at same dpi, because they don't use Bayer sensor patterns, so
resolution is same for all colors. (Bayer resolution is half for red and blue
versus green).
Contrast and AA filter also affect nominal resolution, so comparisons are
always difficult.
http://www.porteous.net/test/digi.html
Tim Hughes
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