Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 238)

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You can select one of four methods to measure the subject brightness.
1
Press the < Q > button ( 9 ) .
2
Select the metering mode.
While looking at the top LCD panel or
in the viewfinder, turn the <
6 > dial.
q : Evaluative metering
w : Partial metering
r : Spot metering
e : Center-weighted average
metering
q Evaluative metering
General-purpose metering mode suited even for
backlit subjects. The camera adjusts the exposure
automatically to suit the scene.
w Partial metering
Effective where there are much brighter lights
around the subject due to backlight, etc. Partial
metering covers approx. 6.2% of the viewfinder
area at the center.
q
Selecting the Metering Mode