I have a roll of a Fujichrome Sensia 100 slide film ready to be processed. This will be my first slide film on my Perfection 4490 (have done only negative films till now). So, people who have experience in this: what should I opt for during processing: mounted or not? I know that the film has to be as flat as possible for best scans and to avoid newton rings. I usually achieve this by leaving a newly processed film under a number of books for a couple of days. So curved film is not a problem anymore. However, mounted slides are easier to handle and view. If I get my slides mounted, would my scanning suffer in any way on Epson Perfection 4490 flatbed scanner? Thanks.