I find the deletion of several questions on slide scanners on thegrounds that it is "digital photography" to be astonishing.
Slide scanners have almost nothing to do with digital photography. I suppose we should also delete any questions on the proper storage of negatives, because that is "furniture", and this is not a forum on home furnishings?
Important images on slides need to be preserved - they will decay over time, especially if they are projected regularly. Anyone who projects slides should have a slide scanner, nobody who only uses digital cameras needs a slide scanner.