Had our lab do a test scan using their imacon 646 on a small area (.8" x .8") of a 4x5 tranny. I find the smallest difference between their scan and the scan made on our new 4990. Both were scanned at 3000 dpi. I believe they applied some sharpening. I used my standard photokit capture sharpener only. Maybe they are not getting the most from their imacon but I expected better. The imacon has slightly finer detail and tonal range but I expected a much sharper scan.