This is the lighting setup I use when capturing 4x5 black and white negatives. (1x2 multiple captures).
I use a 3mm thick acrylic plastic sheet.
Although you can’t see it in this photo, I put a rubber pad between the acrylic plastic sheet and the LED panel.
I use 2 pieces of Tru Vue museum glass.
When I scan, I turn off all lights in the room. Also, I scan 4x5 films with a large black mask.
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