What is the specific explanation of the sunshine 16 rule of photography?

The basic law of sunshine 16 is as follows: when it is sunny outdoors, if the aperture is f/ 16, the shutter speed should be the reciprocal of the international sensitivity index of the film used. For example, in outdoor sunlight, the aperture is f/ 16 and the film sensitivity is EI 100, then the shutter should be1100 second.

"16" in the formula does not mean that the aperture must be f/ 16. If f/ 1 1 is selected, the shutter speed will be doubled to 1/200 seconds, and so on. Secondly, it should be adjusted according to the weather conditions. If it is cloudy instead of sunny, use EI 100 film. If the shutter speed is still1100 seconds, then the aperture should be doubled from116 to1100. And so on.

Extended data function:

For landscape photography, it is often impossible to obtain the best shooting effect by relying too much on the photometric results of the camera. For example, when there is a large dark field in the scene, the camera's metering system will increase the exposure, and the obtained photos will show the effect of overexposure, and the sky will become pale without any details.

At this time, if the "Sixteen Laws of Sunshine" were adopted, this would not happen. The intensity of sunlight is relatively fixed. When the camera aperture is set to F 16 and the shutter speed is set to1125 seconds (ISO is 100), you can take a landscape photo with strong colors and normal exposure.

According to this rule, F/22 aperture should be used in the environment with strong reflection, such as shooting on the beach. When the light is weak, such as cloudy days, F/1aperture should be used.

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