Metering mode is how camera evaluates how should the brightness be distributed in a photograph.
Different cameras/ makes have their own set of algorithms and metering modes.
Canon offers the following which varies basis the model:
- Center-weighted - When subject is largely in the center of frame
- Evaluative - for landscapes to get good overall exposure
- Spot - When in any scene you want to highlight a particular area, high contrast scene where you want to correctly expose
- Partial Metering
Nikon offers the following -
- Matrix
- Center-weighted
- Spot
- Highlight weighted
Sony offers the following -
- Multi-pattern
- Center-weighted
- Spot
- Entire screen weighted
Limitations of Metering mode -
If you want to learn more about metering mode, below are the links of good resources -
