When we are shooting a scene, the brightness of the whole scene cannot be exactly the same. Most of them are bright in some places and dark in some places. We can judge the brightness of a place with our own eyes, while the camera has to measure the brightness of a place with its own metering function. So when we shoot, the metering is to get the correct exposure, otherwise the shooting picture is likely to be over-exposed or under-exposed.
We will see at least three or more on different cameras What is the difference between different metering modes?
The difference between camera metering mode
evaluative metering measures the illuminance of the entire viewfinder screen, which is the most used type of metering mode. The characteristics of the photos taken in this mode are that the overall light in the viewing area is relatively uniform, and the contrast between the dark and the dark is not large, and the photos with relatively accurate exposure can be obtained. It is suitable for environments where the brightness difference is relatively average, such as light environment, scenery, group photos, etc.
Spot metering It is a very accurate metering mode. The metered area is only 2%-3% of the screen, and does not consider the environmental exposure requirements around the subject point. In the operation of using spot metering, the most common thing we use is in an environment with large light ratio contrast, when metering bright or dark light, the whole picture will have a great contrast. For example, when shooting a portrait against the light, the background will be overexposed when measuring the face; when measuring the background brightness, the face is too dark. Therefore, the spot metering mode is more suitable for photography where the contrast between the subject and the background is very different.
The metering area of center-weighted metering accounts for about 20%-30% of the viewfinder screen, and the metering is based on the brightness in the center of the screen. , Other areas of the screen are given average metering. This metering method is not as “extreme” as spot metering, and it is more “precise” than average metering. It is suitable for shooting where accurate metering is required under certain specific conditions, but the metering range around the subject must be taken into consideration.
You can try to take the camera to shoot a pure black or pure white object, you will find that the camera will automatically take a gray image. This is because our eyes can see objects and the camera can shoot objects because the objects themselves can reflect light. The camera’s metering system is to calculate the exposure by collecting the light reflected by the object. The ability of different objects to reflect light is not the same. The camera system cannot determine the ability of each object to reflect light, so a unified standard is needed. The standard of the camera is 18%. With a unified standard, whether you are shooting high-reflectivity objects or low-reflectivity objects, the camera will use 18% of the reflectivity as the standard to measure light.
How to use metering
If the exposure compensation is displayed as 0EV, then it is a midtone that is neither bright nor dark. If it is displayed on the right, which is the positive direction, the photo will be brighter. If it is displayed on the left, that is, in the negative direction, the photo will be dark. The metering is the camera’s own decision, but we can still combine the shooting effect and use exposure compensation to add and subtract exposure based on the camera’s metering results. If the picture is overexposed, then reduce the exposure compensation; if the picture is underexposed , Then increase exposure compensation.
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