Canon EOS 5D Mark III Instruction Manual (en)

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If the image comes out dark or the contrast is low, the brightness and 
contrast can be corrected automatically. This function is called Auto 
Lighting Optimizer. The default setting is [Standard]. With JPEG 
images, the correction is applied when the image is captured.
[Standard] is automatically set in the <
A> mode.
1
Select [Auto Lighting Optimizer].
 
Under the [z2] tab, select [Auto 
Lighting Optimizer
], then press 
<
0>.
2
Select the setting.
 
Turn the <5> dial to select the 
desired setting, then press <
0>.
3
Take the picture.
 
The image will be recorded with the 
brightness and contrast corrected if 
necessary.
3
 Correcting the Brightness and Contrast AutomaticallyN
 
If [z3: Highlight tone priority] is set to [Enable], the Auto Lighting 
Optimizer will be set automatically to [Disable] and the setting cannot be 
changed.
 
Depending on the shooting conditions, noise may increase.
 
If a setting other than [Disable] is set and you use exposure 
compensation or flash exposure compensation to darken the exposure, 
the image may still come out bright. If you want a darker exposure, set 
this to [Disable].
 
If the HDR mode (p.175) or multiple exposure shooting (p.179) is set, the 
Auto Lighting Optimizer will be set automatically to [Disable]. When the 
HDR mode or multiple exposure shooting is canceled, the Auto Lighting 
Optimizer will revert to the original setting.
In step 2, if you press the <
B> button and uncheck <X> the [Disable 
during man expo] setting, the Auto Lighting Optimizer can be set in the 
<a> mode.