Canon EOS 90D Instruction Manual page 832

Performance Data
ISO Speed in Movie Recording
In [ k ] Mode
The ISO speed will be set automatically within ISO 100–12800.

Under [ z : k ISO speed settings], setting [Max for Auto] to [H (25600)]

( = 322) expands the maximum limit of the automatic ISO speed setting
range to H (equivalent to ISO 25600).
In [ M ] Mode
With ISO speed set to [AUTO], the speed is automatically set in a range

of ISO 100–12800.
When ISO Auto is set, under [ z : k ISO speed settings], setting [Max

for Auto] to [H (25600)] ( = 322) expands the maximum limit of the
automatic ISO speed setting range to H (equivalent to ISO 25600).
ISO speed can be set manually in a range of ISO 100–12800. Note that

under [ z : k ISO speed settings], setting [ISO speed range] to
[H (25600)] ( = 322) expands the maximum speed in the manual ISO
speed setting range to H (equivalent to ISO 25600).
[H (25600)] is not available when recording 4K movies, 4K time-lapse movies,
o
or Full HD time-lapse movies.
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