Canon EOS 6D Mark II Mode D'emploi page 177

k Shooting Movies
ISO Speed in the <a> Mode
With [AUTO] (A), the ISO speed will be set automatically within ISO
100 - ISO 25600. Under [z2:k ISO speed settings], if you set
[ISO Auto] to [Max.:H2 (102400)], the maximum limit of the
automatic ISO speed setting range will be expanded to H2
(equivalent to ISO 102400). If you select [Max.:6400] or
[Max.:12800], you can narrow the automatic ISO speed setting
range (maximum limit is lowered).
You can set the ISO speed manually within ISO 100 - ISO 25600 in
1/3-stop increments. Under [z2:k ISO speed settings], if you set
[Maximum] to [H2 (102400)] for [ISO speed range], the maximum
limit for the manual ISO speed setting range will be expanded to H2
(equivalent to ISO 102400). Note that you can also set the
[Maximum] and [Minimum] to a range narrower than the default
range (ISO 100 - ISO 25600).
If [z3: Highlight tone priority] is set to [Enable] (p.135), the
automatic and manual ISO speed setting range's minimum limit will
be ISO 200. Also, even if the ISO speed's maximum limit is set to be
expanded to [H1 (ISO 51200)] or [H2 (ISO 102400)], the maximum
limit will not be expanded.
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