Archived posting to the Leica Users Group, 2001/04/02

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Subject: RE: [Leica] Re: film scanners
From: "Austin Franklin" <>
Date: Mon, 2 Apr 2001 13:33:13 -0400

> >  > >This is great information.  Does the LS-30 have USB
> >>  connectivity?  I don't
> >>  >think the LS-1000 does...
> >>
> >>  both are (Ultra) SCSI.
> >
> >SCSI II probably, but I doubt these are Ultra SCSI.  Do you have
> a URL that
> >shows a spec sheet that they are Ultra SCSI?  I couldn't find anything on
> >their web site, it's pretty lame...
> They are SCSI II.

And they are probably Asynch at that, not even Synchronous...  Why on earth
these scanner manufacturers insist on using Asynch to slow down the SCSI bus
is beyond any reasonable engineering practice.

> If the dynamic range of the Nikon 4000 and 8000 as stated (in Nikon's
> terms) is 4.2...

It will not be in practice.  That just means they have 14 bit A/D
converters...which does not mean the rest of the system can provide clean
data at 14 bits.

A 14 bit A/D gives 16384 maximum unique values and Log 10 of 16383 is 4.2,
which I am reasonably sure is what they are basing their 'claim' on.  It is
inaccurate (and misleading IMO) to make a claim based solely on number of
bits.  The spec should be based on overall system performance, not the
number of bits of the A/D.