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.
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner
info & comparisons
