Help me see what function in the camera is tuned in the following picture 123!

This function is used when shooting AV files or TV files.

When the lower mark is on scale 0, it means that there is no exposure compensation, on the left of scale 0, it means that the exposure is reduced, and on the right, it means that the exposure is increased.

This cannot be adjusted during automatic and manual shooting.

When will it increase and when will it decrease?

There is a sentence in the five-character photography song: "if you add black, you will reduce it."

Let me give you a practical example: when you shoot a still life with a black background, you need to reduce the exposure; If there is a white background around, you need to increase the exposure. Otherwise the exposure will be inaccurate.

This example is very simple, you can try it.