Actually I would need a scanner for documents, but the useful are simply too expensive to me. By now I have a fast scanner for image and slides. I'm just going, relaxed and quick to convert my old slides to digital products. For on-screen rendering rich the 1200dpi (4 slides in 2 minutes) from, for printing on paper I choose the higher resolutions. Dust grains fix in with PS (element), which is faster than to regulate the over the scanner.