WHAT IS METERING?
Metering basically means taking a light reading. Your camera has a built-in meter that measures the amount of light in whatever scene you’re shooting and enables it to determine the appropriate settings to properly expose the photo.
TYPES OF METERING MODES
a) MATRIX METERING
It measures light across the whole frame and the camera sets the exposure automatically to suit the scene.
When to use this mode?
Evenly lit scenes, landscape photography
b) CENTER_WEIGHTED METERING
This light metering mode measures the whole picture area, but it places a higher emphasis on the center of the frame.
When to use this mode?
Portraits, Center Composed Image.
c) SPOT METERING
Spot metering uses a single "spot" of the frame to calculate exposure. Your focal point determines the spot or area of your scene that is evaluated.
When to use this mode?
Properly expose a single object, Create silhouettes, Wildlife.