Canon EOS 70DN Basic Instruction Manual page 418

k Shooting Movies
ISO Speed in Basic Zone Modes
The ISO speed will be set automatically within ISO 100 - ISO 6400.
ISO Speed in the d, s, f, and F Mode
The ISO speed will be set automatically within ISO 100 - ISO 6400.
Under [z3: ISO speed settings], if you set [ISO speed range]'s
[Maximum] setting to [12800/H] (p.123), the maximum ISO speed
for the automatic ISO speed setting will be expanded to H
(equivalent to ISO 12800). Be aware that if you set [Maximum] to
[12800], the maximum ISO speed will not be expanded and remains
ISO 6400.
If [z4: Highlight tone priority] is set to [Enable] (p.145), the ISO
speed will be ISO 200 - ISO 6400.
Under [z3: ISO speed settings], [Auto ISO range] or [Min.
shutter spd.] cannot be set (p.124, 125) for movie shooting.
Under [ISO speed range], if [Maximum] is set to [H (25600)] and you
switch from still photo shooting to movie shooting, the maximum ISO speed
for the automatic ISO range during movie shooting will be H (equivalent to
ISO 12800). It cannot be expanded to ISO 25600.
Using an EX-series Speedlite (Sold Separately)
Equipped with an LED Light
With autoexposure (modes other than a) movie shooting, the camera
will automatically turn on the Speedlite's LED light under low-light
conditions. For details, refer to the EX-series Speedlite's instruction
manual.
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