Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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q
 Selecting the Metering ModeN
254
r
: Spot metering
Effective when metering a specific part of the 
subject or scene. Spot metering covers approx. 
1.3% of the viewfinder area at the center. The spot 
metering circle will be displayed in the viewfinder.
e
: Center-weighted average metering
The metering is averaged for the entire scene with 
the viewfinder center weighted more heavily.
With <q> (Evaluative metering), the exposure setting will be locked when 
you press the shutter button halfway and focus is achieved (in One-Shot AF 
mode). In the <w> (Partial metering), <r> (Spot metering), and <e> 
(Center-weighted average metering) modes, the exposure is set at the 
moment the picture is taken. (Pressing the shutter button halfway does not 
lock the exposure.)