I must say I was impressed by the scan quality BUT there seems to be a problem with DUST that is embedded UNDER the GLASS causing marks in your scanned image. Amazon sent me a replacement within a few days of getting the original but this one also had dust under the glass but in a different place. If you scan at 600+ DPI once with a white sheet of paper and once with a black sheet of paper (ensure top of glass is clean) you will be able to see if your scanner has this problem when you zoom in on the final image. When examining the physical glass use a torch at a 45' angle to see more easily. Some dust is white reflective and some are black reflective (black dust is hard to see with the naked eye). Also you should re-clean the top glass and re-test to ensure your dust is really underneath. A tiny bit of dust in the area you will be scanning a negative will totally ruin the final image if you don't notice it right away. Sure you can scan only in one area of the scanner that is dust free or you can remove it with software but when you have a lot to scan this can add days on to your work load.