Tom, my system, which is updated a bit from the video, gets about 3200 spi. Daniel has a D810. He gets over 4000 spi. Both figures are significantly more than an Epson, and they get about 1 stop more dynamic range. Using a pixel shift camera might cut down on the number of pictures needed. The best way to look at this is to think about the largest print you might make, and then work backwards to the needed resolution. There might also be a noise/dynamic range advantage to a pixel shift camera.
Alignment and vibration characteristics are extremely important at high magnifications. I cringe a bit when I see some copy stand setups.
What I like most about a digital camera system is the ability to fine-tune exposure.
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