What is the exposure control in photography?

Auto exposure is the default setting for many digital cameras. In this exposure mode, the camera will automatically control the shooting exposure, and the user does not need to do anything at all. The sensor on the camera can automatically set the aperture value and shutter speed according to the intensity of light reflected from the scene. Exposure control is mainly used to adjust the overall brightness of the scene. If the subject is too dark, you can adjust the exposure compensation ratio to increase the brightness. High-end digital cameras can support 2-3 levels of adjustment in each direction (enhanced 1/3EV), while other lower-priced digital cameras support 1-2 levels of adjustment (enhanced 1/2EV).

In the shutter priority mode, you can customize the shutter speed, and the camera will automatically adjust the optimal aperture value according to the set shutter speed. If the shutter speed increases, the camera will automatically reduce the aperture value. If you slow down the shutter speed, the camera will automatically increase the aperture value, thus keeping the exposure value unchanged. In the aperture priority mode, you can customize the aperture value, and the camera automatically sets the shutter speed according to the actual shooting environment, thus seeking the best exposure setting. The larger the aperture value, the smaller the lens opening. If the aperture value changes, the camera will automatically adjust the shutter speed to ensure that the exposure setting is always in the best state.

For professional photographers, it may be more willing to use manual control, because it can give full play to their intelligence, enjoy the fun brought by photography and shoot higher quality images. Many digital cameras have the ability to shoot multiple images in a short time, which is very suitable for shooting sports, children's games, animal images and so on. In continuous shooting mode, the flash cannot be used, and the image is stored for a longer time.

Some high-end models also support auto-bracketing exposure mode, in which the camera can take a group of images with the same exposure settings. Many models support three continuous shooting images under the same exposure setting, some models support five continuous shooting images, and some high-end models also support user-defined aperture value and shutter speed. There is also the best shooting selection mode. In this mode, the camera can take four or nine images in a short time, and each image adopts extremely subtle white balance or exposure settings. This function is very similar to automatic bracketing exposure. In this mode, the camera can automatically select the image with the best exposure effect and definition.