therwol wrote:
I've done slides (and negatives from the late 60s onward.) I have used and Epson V800 scanner as well as my Nikon D810 with a 55mm Micro lens over a light box. Number two problem is crud on the slides, and I could never get all of it off, but post processing can clean them up. I have no idea how the crud got there. All of my slides and negatives have been handled carefully.
There are solutions you can buy intended specifically for cleaning slides/transparencies. I can't remember the name right off hand but it's readily available from photo supply houses.