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Category Archives: Science of photography

How Many Photons in a Photograph?

We photographers deal in photons, those baffling quanta of light. But just how many photons does it take to make a photo, to expose a single 35mm negative? Let’s assume an arbitrary exposure at EV13, which is 1/1000 @ f5.6, ISO 400.  And let’s assume we are taking the worlds most boring photograph – a […]