I never know if this is the correct section to put topics about the SX-70 but I figure the Low Fidelity crowd may appreciate this even though the SX-70 is most definitely not lo-fi (click through the link to see what I mean).
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Back in the early 70’s designers Charles and Ray Eames created a short 10 minute film for Polaroid about their newly released SX-70. The film is a fascinating look at a camera that was quite revolutionary for the time.
Especially interesting is the part of the film where they show the inner workings of the camera.