When ever I make a drum scan of a 4x5 at 4000 dpi or higher I tend to get these banding lines. It doesn't appear on any of my scans at 2000 dpi. The first pic is a scan of a B&W film. I also noticed it on my Provia 4x5 scan @ 4064 dpi and it shows when I do a negative scan. I have included a couple of pictures do you have any idea of what it could be? I altered the picture of the provia scan with levels in photoshop to emphasize the lines in the scan.
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