Sunny 16 Rule

Kodak Stereo Camera settings.

If you don’t have a light meter available (maybe you’re shooting with an old meterless camera, for example), and you’re shooting in direct sun, you can try the “Sunny 16 Rule:”

On a clear sunny day, you should get a decent exposure if you set the f stop to 16, and the shutter speed to the reciprocal of the ISO you’re using (film or digital sensor). That means, if your ISO is 100, you would set the shutter speed to 1/100 (or use the closest shutter speed available on your camera, like 1/125). If your ISO is 400, use a shutter speed of 1/400, etc.

Sunny 16 rule camera settings.

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