@Uncle Frank Here's my slide copying setup. The A4 light table (LED, ~¥2000) is on a couple tissue boxes to raise it slightly, and each side of the slides is some thin cardboard to both hold them in place a little and to mask off the bright light table on each side, so that the camera's meter only/mostly reads the light thru the slide itself. Macro lens, and distance to the slide is a few centimeters over its minimum focus distance. I stop it down to f11 for good depth of field, but that means slow shutter speeds--so an electronic 'cable release' for the shutter to the right, which keeps things steady.
Following what I've read online, I turn the emulsion side up (it's less shiny than the other side, and is what you really are trying to get a picture of). That does result in an in-camera picture that I then have to flip in the computer (so that any words read right, and vehicles drive on the proper sides of roads).
My macro lens doesn't get to 1:1, so another repetitive task on the computer is cropping each shot down. Also, I'm not too careful at this point about squaring things up, so rotating the image on the computer is another step.
Adjustments then depend on many factors. The best slides just need a bit of white balance correction. Some others that have exposure issues take more work.
On the table to be copied you can see two shots (slides) of a young girl at a door--the result of that is the next pic, below. (And at this point, I've left a bit of the slide mount in the pic as a border. Final editing will crop that down more.