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I did a lot of my MS thesis petrography work on an ancient brass tubed Leitz scope that I found squirreled away in a cabinet in the pet lab. Prior to the digital photography revolution some folks I know used those 5x7 plate backs with polaroid film to take photomicrographs. I have a couple of the film holders on a shelf behind me. I just use an inexpensive digital camera to take pics of rock thin sections these days.
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