Copying slides is easy, but negatives require careful conversion to positives. Neither is quite grain sharp but good enough for a 20"x20" print, perhaps larger with interpolation. A 24 MP camera would yield a maximum of 4000 x 4000 pixels. The best resolution I can muster with a Sony A7Riii is 5340 x 5340 pixels, less if you crop appropriately.
I use a Novoflex focusing rail with a film holder.
The next level down would be using a digital camera and a copy table or fixture. The results are grain-sharp for most common emulsions. The color conversions is automated, and there is ICE for dust and scratch reduction. It's best to crop inside the borders of the actual image for better color and exposure, which can be done on the thumbnails on a batch basis. A Nikon LS-8000 scans at 4000 ppi, yielding an 8500x8500 pixel scan from 6圆 film. Nothing comes close to the resolution of a dedicated film scanner.
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