I think a lens and an adapter are a better idea. I have investigated this once for myself, as I have a few thousand old slides sitting on the shelf. As it was a while ago, I cannot tell you all the details from the top of my head, but I found that a cheaper solution is to get Nikkor Micro 40 mm f/2.8G and an appropriate (third party) adapter. ES-1 adapter is a bit overpriced, considering that it is just a piece of plastic. You can use a flash as a source of white light. I'm going to do this at some point.
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