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Digital technology has really only recently caught up to film in terms of quality (and I'm sure there are some that would still argue that). It would take a lot more expensive scanner than I am using to get the maximum quality digital image possible from these slides. There's a point of diminishing returns though. A lot more money for relatively subtle improvements. But at least with digital, the quality does not degrade over time.

I agree with that. I guess the original Bladerunner movie was shot in 4k and the recent remake was a scan of the original film I think.