When taking pictures, how to set the aperture shutter sensitivity to get the correct exposure?

Exposure is the basis of photography. Exposure, easy to understand, complex to complete control. Different environments and different themes have different requirements for exposure. Below, let's start with the introduction to understand the three elements of exposure.

hole

Aperture is a technical term in a lens, that is, there is a hole in the middle of the lens to let light pass through to reach the camera. You can understand it as a door. Other things being equal, if the door is wide open, there will be more light coming in and the photo will be bright; If the door is small, there will be less light coming in and the photos will be dark. The aperture is represented by "f", which has universal values:11.4/2/2.8/4/5.6/8/116/22, etc.

The larger the aperture, the smaller the value; Conversely, the larger the value. For example, the aperture of F5.6 is larger than F 1 1 and smaller than F2. Then, that is to say, the smaller the aperture value, the more light enters; On the contrary, the larger the aperture value, the less light will enter.

Shutter speed

Shutter speed refers to the length of exposure time, which you can understand as the time to open and close a door. Other things being equal, the longer the door is opened, the more light comes in, and the brighter and darker the photo is. Shutter speed is expressed in numerator denominator, and there are also common values S:110, 1/30, 1/60,1125, 1/250. There are also slower ones: 30 seconds/15 seconds /8 seconds/1 second, etc.

The faster the shutter speed, the less light entering and the darker the photo; On the contrary, the brighter.

speed

Sensitivity refers to the ability of the image sensor to feel light, which you can understand as the brightness of the room itself. Other things being equal, the brighter the room, the easier the exposure is to be normal; On the contrary, darkroom is not easy to be exposed normally. Sensitivity is expressed by ISO: ISO 100, ISO200, ISO400, etc. Sensitivity will affect the quality of photos.

Basic exposure technique

How to set these three key factors when the general lighting environment is sufficient? First, set the ISO to the lowest, then set the aperture to the maximum (except fixed focus), and finally adjust the shutter speed to achieve normal exposure. This is the most basic collocation skill.

Advanced exposure technology

In actual shooting, we often encounter more complicated situations. At this time, it can't be adjusted according to the basic exposure skills. Give a few common examples. In a room with closed light, or shooting at night, because of insufficient light, the aperture may be opened to the maximum, and the photo will be underexposed. You can't lower the shutter at will, because the photo may be blurred due to jitter, which takes at least 1/60 seconds. At this time, it is necessary to improve ISO and expose photos normally without losing some image quality.

On the other hand, if you want a clear picture, that is, a large depth of field, you need to lower the aperture. Such photos may be underexposed. At this time, the shutter speed can be reduced to balance the exposure.

For another example, if you want to capture moving objects, such as athletes and skateboarders, you need a high shutter speed, such as 1/2000 seconds. This may darken the photo, so you need to turn up the aperture. If you set the aperture to the maximum, the photo will still be dark, and then increase the sensitivity.

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