The relationship between f and s in photography and its calculation formula

F is the aperture value and s is the exposure speed of the shutter. The relationship between the two is actually very simple, but you must first be familiar with the data of each level of the aperture f value. The commonly used f values of each aperture are: 1,1.4,2,8,4,5.6,8, 1 1,16,22,32,44. The smaller the f value, the larger the aperture. If the aperture is enlarged by one step, the amount of light entering will double. In order to ensure the original exposure, the speed will be doubled. For example, for a photo with correct exposure, use: F8, s =1/200 (the setting of ISO value should also be fixed). If it is changed to F5.6, then S= 1/400 (if the aperture is increased by one level, the speed will be doubled), if it is changed to F 1 1, then S =1/00 (if the aperture is decreased by one level, the speed will be doubled). Other calculation methods and so on.

I hope it helps you.