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sunny 16

Often called the sunny 16 rule, it s a quick guideline for exposure on a bright sunny day: Set the aperture at f/16 and the shutter speed to the fraction closest to the film s speed (for example, 1/125 second for ISO 100 film).

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sunny 16

A method for achieving exposure without a light meter on a sunny day by setting the aperture to f/16 and the appropriate shutter speed.
guidtofilmphotography