Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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q
 Selecting the Metering ModeN
1
Press the <n> button. 
(9)
2
Select the metering mode.
 
While looking at the LCD panel, turn 
the <6> dial.
q
Evaluative metering
w
Partial metering
r
Spot metering
e
Center-weighted average 
metering
q
 Evaluative metering
This is a general-purpose metering mode suited 
even for backlit subjects. The camera sets the 
exposure automatically to suit the scene.
w
 Partial metering
Effective when the background is much brighter 
than the subject due to backlighting, etc. Partial 
metering covers approx. 6.2% of the viewfinder 
area at the center.
 
In [z2: Auto Lighting Optimizer], if the checkmark <X> for [Disable 
during man expo
] is removed, it can be set in the <a> mode (p.142).
 
When ISO Auto is set, you can press the <A> button to lock the ISO speed.
 
After recomposing the picture, you can see the exposure level difference 
on the exposure level indicator (p.22, 23) compared to when you pressed 
the <A> button.
q
 Selecting the Metering ModeN
You can select one of four methods to measure the subject brightness. 
The metering mode is set automatically to evaluative metering in the 
<
A> mode.