Also bear in mind that Dmax quoted by scanner manufacturers is usually measured by their own methodology which they do not divulge - ie the marketing department largely make the numbers up. So you cant compare one with another and certainly cant compare to actual EV in slides. I don't think there are any true consumer scanners with a 'true' Dmax of 4 - not even the Nikons, even though they may be close.
> -----Original Message----- > From: Knut Kampe [mailto:[EMAIL PROTECTED]] > Sent: 30 August 2002 17:45 > To: [EMAIL PROTECTED] > Subject: Re: Sanning negs vs positive tranparinces > > > At 00:15 31.08.02 +1000, you wrote: > >On 29 Aug 2002 at 15:05, Herb Chong wrote: > > > > > negatives have less brightness range than slides. you > will still get > > > best results from scanning slides if you have a good > enough scanner. > > > >Why do you believe this? Scanning negs gives a far superior contrast > >range, you > >can never get beyond a little over 4 stops from a slide. [Rob] > > Rob, I think Herb is right: > > It relates to the Dmax a scanner can resolve. A neg only has > a Dmax of 2-3; > thus a scanner with a similar Dmax may be better served with > neg film as > the contrast range of what is on the negative film can be > fully captured. > > Picture libraries are picky -in contrast to what you mused- they also > serve customers that require stunning images for calenders > etc, they do go > for max quality! The latitude problem of slides (higher range > between 0 and > Dmax on slides) was never a problem on high end scanners in > use in the > picture libraries. Of the pro's I know in the scene, none > have switched to > negatives, but I agree that such information is just > anecdotal evidence. > > It really depends on which scanner you buy: It is important > to check the > Dmax and if it is below 4, you might be better off with negs. > > Knut > >
