Digital BW, The Print

I have a 4990 and did a resolution test using a 35mm Tech Pan negative of
the USAF resolution target.  My scanner hit peak resolution at 4800 dpi -
could read 55 line pairs/millimeter (lp/mm) off the scan of the USAF test
target negative.  I got 50 lp/mm at 3200 dpi and progressively lower lp/mm
at lower dpi settings.  The higher extrapolated dpi settings (>4800) of
the 4990 did not give greater lp/mm resolution values. I think lp/mm is a
more realistic metric for scanner resolution than dpi.



I routinely scan 120 negs at 4800 dpi and 4x5 at 3200 dpi for files of
~250mB and ~500 mB respectively.  Files larger than ~500mB really start to
choke my PC with 3 gigs of RAM and CS2 when working on the images.  I
don't care how long the scan takes or how much disk space is occupied -
I'm trying to wring the most quality out of my scans I can with the
equipment I have.



FWIW,



TK



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