Originally Posted by
Bruce Watson
One often overlooked problem with an enlargement like this is file size limitation (it's still a 32 bit world because of the OSes and applications). Current technology will limit the file size you can make from your 5x4 film to about 2 GB. Assuming 16 bit grayscale file (I wouldn't use an 8 bit file because of the danger of posterization while you are doing your image editing), that puts your scan resolution right around 7750 spi. There's only a few drum scanners that can give you a real optical resolution in that range (Aztek Premier, ICG 380, and the latest Screen). Your final print will then be around 172 ppi output, best case.
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