Auto Lighting Optimizer; Highlight Tone Priority - Canon EOS 5D Instruction Manual

3 Custom Function SettingsN
C.Fn II -3
0: Disable
1: Enable
Improves the highlight detail. The dynamic range is expanded from the
standard 18% gray to bright highlights. The gradation between the grays
and highlights becomes smoother.
With setting 1, noise in the shadow areas may be slightly more than usual.
With setting 1, the settable ISO speed range will be 200 - 6400.
Also, <A> (dynamic range) will be displayed on the LCD panel and in the
viewfinder.
C.Fn II -4
If the images comes out dark or the contrast is
low, the brightness and contrast are corrected
automatically.
For RAW images, the content of the settings in
the camera can be applied when processed with
Digital Photo Professional (bundled software).
0: Standard
1: Low
2: Strong
3: Disable
Depending on the shooting conditions, noise might increase.
This function will not work if manual exposure or bulb exposure has been
set.
In fully-automatic modes (1/C), [Standard] will be set automatically.
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Highlight tone priority

Auto Lighting Optimizer