Rule table of the Sixteen Rules of Sunshine

The formula for Sunshine 16 is as follows:

The basic rule of Sunshine 16 is as follows: In outdoor sunlight, if the aperture is f/16, the shutter speed should be the international standard of the film used. The reciprocal of the sensitivity index. For example, in outdoor sunlight, if the aperture is f/16 and the film sensitivity is EI100, the shutter speed should be 1/100 second.

The "16" in the formula does not mean that the aperture must be f/16. If you choose f/11, the shutter speed will be doubled to 1/200 second, and so on. Secondly, adjustments should be made according to the weather conditions. If it is not sunny but cloudy, use EI100 film. If the shutter speed is still 1/100 second, the aperture should be doubled from 1/16 to 1/11; and so on. .

The function of aperture:

1. It can adjust the amount of light entering the lens. For example: the pupils of domestic kittens always shrink to a line during the day. At night, it automatically opens into a round hole.

2. Aperture is the most important factor in determining the depth of field. Small aperture (large aperture value) means deep field of field; large aperture (small aperture value) means shallow depth of field. For example: Friends with myopia, if they don’t wear glasses, always squint their eyes to see things more clearly. In photography terms, this is called: narrowing the aperture (pupil), increasing the Depth of field.