We scan using a camera. Over the years we have had many scanners, drums, Leaf CCD, and large flatbeds, but I find the most versatile is using a DSLR with proper lighting.
We have rigs for scanning 35mm slides and film strips, and 4x5 film and polaroids.
For scanning larger art we have perfected a solution using polarized light and low distortion lenses to get the optimal image reproduction of your work. I would say at any size but it has to fit thru the door.
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