Canon EOS R3 Advanced User's Manual page 321

Setting via the menu
1.
Select [
2.
Select the metering mode.
Evaluative metering
General-purpose metering mode suited even for backlit subjects. The camera adjusts the
exposure automatically to suit the scene.
Partial metering
Effective where there are much brighter lights around the subject due to backlight, etc.
Spot metering
Effective when metering a specific part of the subject. The spot metering area is indicated on
the screen.
: Metering mode].
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