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

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You can minimize overexposed highlight areas.
1
Select [Highlight tone priority].
 
Under the [z3] tab, select 
[Highlight tone priority], then press 
<
0>.
2
Select [Enable].
 
Turn the <5> dial to select [Enable], 
then press <
0>.
 
Highlight details are improved. The 
dynamic range is expanded from the 
standard 18% gray to bright 
highlights. The gradation between the 
grays and highlights becomes 
smoother.
3
Take the picture.
 
The image will be recorded with 
highlight tone priority applied.
3
 Highlight Tone PriorityN
 
With [Enable], the Auto Lighting Optimizer (p.142) is automatically set to 
[Disable] and the setting cannot be changed. When [Highlight tone 
priority
] is set to [Disable], the Auto Lighting Optimizer will revert to its 
original setting.
 
With [Enable], image noise may increase slightly more than with 
[Disable].
With [Enable], the settable range will be ISO 200 - 25600 (ISO 200 - 12800 
for movie shooting). Also, the <A> icon will be displayed in the viewfinder 
and on the LCD panel when highlight tone priority is enabled.