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I wonder if there is an alternate optical solution using a macro lens. Use an even backlight and a dedicated macro lens to take a digital picture of the negative and postprocess. This is essentially what the Hasselblad scanner seems to be doing.

I use a copy stand, light table, and glass plate with a 1:1 macro lens. Stitching for medium and large format negs. It works quite well.

That’s basically how everyone did internegatives, but with the lights on.

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