Canon EOS-1D X Mark III Advanced User's Manual page 303

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ISO speed settings
• ISO speed
In < > mode, you can set the ISO speed manually. You can also select ISO
Auto.
• ISO speed range
For < > mode, you can set the manual ISO speed setting range (minimum and
maximum limits).
• Max for Auto
You can set the maximum limit for ISO Auto in movie recording in <
< > mode or in <
Highlight tone priority
You can reduce overexposed, clipped highlights as you record movies. For details on
Highlight tone priority, see
> mode with ISO Auto.
Highlight Tone Priority.
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