Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 111)

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Three methods (metering modes) to measure the subject’s brightness
are provided. Normally, evaluative metering is recommended.
In Basic Zone modes, automatic selection is set automatically.
1 Select [Metering mode].
Under the [z2] 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 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. The
gray area in the left figure is where the
brightness is metered to obtain the standard
exposure.
e Center-weighted average metering
The brightness is metered at the image center
and then averaged for the entire scene. This
metering mode is for advanced users.
q Changing the Metering ModeN
With q (Evaluative metering), the exposure setting will be locked when you
press the shutter button halfway and focus is achieved. With w (Partial
metering) and e (Center-weighted average metering), the exposure
setting is set at the moment of exposure. (The exposure setting is not locked
when you press the shutter button halfway.)
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