How does Canon 7D choose metering mode?

The choice of metering mode needs to be decided according to the shooting scene, light and shooting theme at that time, and it is necessary to understand the differences between several metering modes first. How to select metering mode 1? Difference of measurement mode 1. Evaluation photometry is the standard photometry mode of EOS camera, which is suitable for most subjects. After the camera detects the comprehensive lighting elements such as the position, brightness, background and lighting conditions of the subject in the viewfinder, it sets the correct exposure for the subject. 2. Due to backlight and other reasons, partial metering is very effective when the background is brighter than the main body. Photometry is concentrated in the center of the viewfinder, covering a part of the center of the viewfinder. 3. Spot metering is used to measure the specific part of the shooting object or scene. Photometry is concentrated in the center of the viewfinder, covering a small area in the center of the viewfinder. 4. Central focus average metering focuses on the center of the viewfinder and then averages the whole scene. Second, how to choose 1. Evaluation photometry: In most cases, evaluation photometry can get a basically accurate exposure value. So it is suitable for shooting most scenes with even light and dark. If you are proficient in exposure compensation, it is suitable for shooting more scenes. 2. Partial photometry: generally used for shooting backlight films. 3. Spot metering: If you are sure to ignore the surrounding parts, partial metering and spot metering can get a more accurate exposure value. This can keep the subject exposed correctly, and the background will be too bright or too dark, which is generally used for macro and close-up shooting. 4. Center key average metering: If you are sure that the surrounding parts need to be considered a little, you can choose center key average metering. This subject is not particularly ideal, but the surrounding and background will not be too bright or too dark, and some consideration will be given. Suitable for shooting in the morning, sunset and sunset.