What's the difference between exposure compensation and ISO?

Exposure compensation is to increase the brightness of the picture, and increasing ISO sensitivity is also to increase the brightness of the picture.

Introduction:

First, you may feel that the shooting target is not bright enough when taking pictures. At this time, exposure compensation (EV value) or improving sensitivity (ISO) seems to have the same effect.

Second, but there are differences between them, and the application direction is also different.

Exposure compensation mainly deals with photometric deviation. When the overall environment is bright, the main part is dark and the details are lost, exposure compensation can be used. On the contrary, if the overall environment is dark and the subject is bright, the exposure should be reduced.

The processor of the camera will automatically increase or decrease the exposure according to your shooting mode, so as to achieve the correct exposure of the subject or some special effects. According to different shooting modes, the adjustment of exposure can be aperture, shutter or combination adjustment. For example, aperture priority will mainly adjust the shutter, and shutter priority will mainly adjust the aperture.

Sensitivity is a concept left over from the film camera era, which represents the reaction speed of film. The sensitivity ISO of digital camera is realized by adjusting the sensitivity of photosensitive devices or merging photosensitive points, that is, by improving the sensitivity of photosensitive devices or merging several adjacent photosensitive points, the ISO can be improved.

Sensitivity adjustment enhances the brightness of the whole picture at the expense of pixel quality.