I just bought an Epsom 4490, mainly for scanning documents. I, nevertheless started to test the film and slides features.

Just reading, this thread, I learned how prints should be scanned.

Now for 35mm negatives and slides, what would be the best solution?

The maximum physical resolution is 4800 dpi (main scan) and 9600 (sub scan). I wonder if 9600 is a physical or computed value?

Anyway, I always scan at the best resolution and resize the copy for the web if required just as I do with my SLR digital camera.