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RE: filmscanners: 35mm film versus medium-format scan quality (Epson 2450)

On Fri, 7 Dec 2001 14:47:44 -0500  Austin Franklin 
(darkroom@ix.netcom.com) wrote:

> I don't quite know what you mean.  The physical sensor IS 4000 sensors 
> per
> inch.  The lenses used SHOULD be capable of resolving to beyond that...

Actually there's a good reason for using a lens which resolves less than 
the CCD ppi, and that is aliasing. Slight defocus is beneficial here, 
which is why some digicams like the Nikon D1 incorporate a filter to 
degrade the performance of those pricy Nikon optics. I have often wondered 
if the tendency of Nikon scanners to produce more aliasing than 
competitors isn't entirely down to the semi-collimated LED lightsource but 
because the lens is a bit too good.


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons


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