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Got to tell you that this is one of the best pinhole tutorials I've found. Started off by wanting to adapt a 6x4.5, 6x7 film back (or even a 4x5 film holder) for pinhole. NOW I want to make a curved focal plane camera. I'm only worried about how to keep the film tight to the "pressure plate" guides without pulling it too tight and flexing it across the wrong axis. Also, keeping the spools tight enough to not unwind, but loose enough to move easily.
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