How does exposure compensation work when a camera is in an automatic mode?

It tells the camera to shift the exposure it would otherwise set from its light-meter recommendation. Positive compensation asks for a lighter image; negative compensation asks for a darker image. You are adjusting the camera’s automatic recommendation, rather than simply switching off automatic exposure. [S2]

Think of it as asking for a result in a particular direction. It does not specify an exact appearance for every part of a picture; check the resulting photo to see whether the change suits your scene.

Let your intended result guide you: try positive compensation if the automatic result looks too dark, or negative compensation if it looks too bright. Make an adjustment, take a photo, and review it. If it is still not where you want it, adjust again rather than assuming one value will suit every scene.

For example, suppose a test photo looks darker than you intended. As a starting point, try a positive adjustment and take another photo to compare. If the new result is too light, reduce the adjustment or move it back toward zero. This is a practical example, not a prescribed value for every camera or scene.

Check your camera’s manual for the control, available modes, and adjustment range. These differ between cameras. [S2] For one specific example, Canon documents exposure compensation on the EOS 5D Mark II in P, Tv, and Av modes, within ±2 stops in 1/3-stop increments. Those details apply to that model; they are not a general rule for other cameras. [S1]

Use this practical sequence:

1. Choose the automatic exposure mode you intend to use.
2. Find the documented compensation control for your camera and mode.
3. Select a positive or negative value based on the result you want.
4. Take a photo and review it.
5. Adjust again if needed, and check the setting before moving on to another scene.

If you cannot find the control or it does not work as expected, consult the manual for your camera and selected mode. The Canon example does not establish what controls or ranges other models offer.

Review the photo and ask whether it is closer to the brightness you intended. If possible, compare it with the previous photo. If the change made the result less suitable, move the value toward zero or try the opposite direction. This review is a practical check, not a guarantee that the camera display will match how the photo appears elsewhere.

To keep track of what you tried, jot down a brief note: “Scene: [description]. First result: [too dark / too bright / suitable]. Change: [positive / negative / none]. Next check: [what I will compare]. Setting to revisit: [value or control].”

Before moving on, check whether you still want that compensation for the next scene. A setting that helped with one photo may not be right for another.