How to control the three elements of photographic exposure in camera exposure

First of all, say three elements. The most important function of aperture shutter sensitivity (ISO) is to control luminous flux and depth of field. The shutter controls the exposure time and sensitivity. If the light is not ideal, you can get the correct exposure by increasing or decreasing the sensitivity. In order to control exposure, we should be familiar with the use of reciprocity. For example, the correct exposure EV value is 1, and the exposure combination we get is shutter 125 aperture 8 ISO 200. In order to achieve other special effects, we can use reciprocity transformation to get the EV value 1. Other exposure combinations such as 60 8 100,

125 5.6100,250 8 400 If you want a shallow depth of field, it can be 1000 2.8 200,1000/0.4100. These groups of exposures are all the same, that is, we assume EV = 65438+. hope this helps