It's been several years, but I seem to remember that when I got my Nikon 4000ED filmscanner they were claiming a Dmax of somewhere around 3.5 to 4.0, but I measured it (by scanning a Kodachrome IT8 target slide and examining the greyscale separation) at around 2.1 to 2.9 (don't remember the exact number). This kind of disparity between manufacturer's claims and real-life performance is the rule, not the exception.
--Bill At 8:30 PM -0600 3/24/05, Andrew Skretvedt wrote: >In evaluating a film scanner, one should consider its dynamic range. How >deep can a scanner reach in and pull out shadow details from a very >contrasty slide, for example. What about one that might have been >underexposed a bit as you tried to keep from blowing out highlights? > >I've seen some dynamic ranges posted for certain scanners here and >elsewhere, many appear to be measured figures. But for the Minolta >DiMAGE Scan Dual III and IV, the posted figure is 4.8 (calculated). > >That figure appears to be the theoretical dynamic range for the bit >depth of the capture. Of course this is not going to be its true range. >Does anyone know the actual range of these scanners? How is dynamic >range measured? -- ====================================================================== Bill Fernandez * User Interface Architect * Bill Fernandez Design (505) 346-3080 * bf_list1 AT billfernandez DOT com * http://billfernandez.com ====================================================================== ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
