Originally Posted by
koraks
That's odd. I have a 4990 as well and years ago, I did some testing and found that I got marginally better resolution if I used the film holders and shimmed the holders so that they were roughly 1mm higher than usual. With negatives placed directly onto the platen, resolution was noticeably degraded. My results were in line with what was widely reported and also the reason why the BetterScanning holders (which I don't have BTW) have an adjustable height setting that allows the film holder to be raised a little above where the stock holder sits. Perhaps something is slightly out of alignment in your scanner?
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