Only available in P, S, A modes and most effective with center-weighted or spot metering.
- Matrix (default): Camera meters a wide area of the frame and instantly sets exposure according to distribution brightness, color, distance, and composition for natural results.
- Center-weighted: Camera meters entire frame but assigns greatest weight to center area. Classic meter for portraits
- Spot: Camera meters exposure in active focus point only. Ensures that the subject will be correctly exposed, even the background is much brighter or darker.
Rule of thumb:
- positive when main subject is darker than background
- negative when main subject is brighter than background