What does the gain of Sony camera 280 mean?

The gain of the camera is equal to the exposure compensation of the camera.

In other words, when shooting in a poor light environment, the camera can't get enough light and can't achieve a bright picture effect. At this time, turn on the gain switch, and the processing system inside the camera will automatically raise the brightness of the picture to a certain standard.

Of course, the gain brings the loss of image quality, that is, it will increase noise more or less.

Never turn on the gain in a well-lit environment!