Sunny 16 Calculator

Determine correct exposure settings using the Sunny 16 rule for any lighting condition without a light meter.

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How It Works

The Sunny 16 rule says: on a bright sunny day, set aperture to f/16 and shutter speed to 1/ISO. From there, each lighting step down opens one stop. This rule has been used by photographers for over a century and remains reliable for quick metering without electronics. It is especially useful with manual film cameras or as a sanity check on your meter reading.