How to choose metering mode?

There are about four common measurement modes. I. Evaluation photometry The biggest difference between evaluation photometry and central key photometry is that evaluation photometry divides the viewing screen into several photometry areas, and each area measures light independently, and an integral exposure value is calculated through integral weighting. The initial evaluation photometry is generally divided into several sections. Multi-area evaluation photometry is a kind of judgment that simulates the uniform or uneven illumination that the human brain often encounters when shooting. Even people who are not familiar with photometry can generally get films with more accurate exposure in this way. Second, the central part measurement and the central average measurement of partial measurement are two different measurement methods. The center average photometry is mainly based on the central area, supplemented by other areas, while the central part photometry only measures one area in the center of the picture, and the photometric range is about 3% to 12%. The central part metering mode is suitable for some scenes with complex light, and more accurate exposure is needed at this time. Using the central part to measure light, you can get photos with accurate exposure of the object. 3. Spot metering The range of spot metering is to take a small area in the center of the window as the exposure reference point, and the metering area is 1% to 3%. The camera uses the light measured in this narrow area as the exposure basis. This is a fairly accurate photometric method, but it is not so easy for beginners to master. Therefore, people who like macro photography must study this metering method hard and initially choose the middle small area in the picture as the metering reference point. Spot metering is also a good weapon in portrait shooting, which can accurately expose the parts of the characters. Fourth, the central key average metering Central average metering is the most widely used metering mode, and almost all camera manufacturers use central average metering as the default metering method for cameras. Central average photometry mainly takes into account that general photographers are used to putting the subject, that is, things that need accurate exposure, in the middle of the viewfinder, so this part of the shooting content is the most important.