Just had the thought: want digital preview for your scene? Put a white sheet of paper or plastic in a film holder, and mount a tiny camera to the inside of your lens board.
There are tiny cameras now (really, really tiny!) that would take up very little space on a lens board. The DOF is huge, so the lens wouldn't have to be realigned as the lens board goes through its movements. You'd be able to tell when you're running out of coverage, and you could dial in coarse focus fairly quickly.
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