Canon EOS Rebel T3i 18-55mm IS II Lens Kit - Manual (Page 102)

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Four methods (metering modes) to measure the subject’s brightness
are provided. Normally, evaluative metering is recommended.
In Basic Zone modes, evaluative metering is set automatically.
1
Select [Metering mode].
Under the [2] tab, select [Metering
mode], then press <
0>.
2
Set the metering mode.
Select the desired metering mode,
then press <
0>.
q Evaluative metering
This is an all-around metering mode suited for
portraits and even 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. The gray
area in the left figure is where the brightness is
metered to obtain the standard exposure.
r Spot metering
This is for metering a specific part of the subject or
scene. The gray area in the left figure is where the
brightness is metered to obtain the standard
exposure. This metering mode is for advanced users.
e Center-weighted average metering
The brightness is metered at the center and
then averaged for the entire scene. This
metering mode is for advanced users.
q Changing the Metering ModeN
With q, the exposure setting will be locked when you press the shutter
button halfway and focus is achieved. With w, r, and e, the exposure
setting is set at the moment of exposure. (The exposure setting is not locked
when you press the shutter button halfway.)
COP
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