Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Set the ISO speed (image sensor’s sensitivity to light) to suit the 
ambient light level. In the <A> mode, the ISO speed is automatically 
set (p.179).
Regarding the ISO speed during movie shooting, see pages 337 and 
341.
1
Press the <m> button 
(9)
.
2
Set the ISO speed.
 
While looking at the LCD panel or in 
the viewfinder, turn the <6> dial.
 
ISO speed can be set within ISO 100 
- ISO 32000 in 1/3-stop increments.
 
A” indicates ISO Auto. The ISO 
speed will be set automatically 
(p.179).
ISO Speed Guide
* High ISO speeds will result in grainier images.
i
: Setting the ISO Speed for Still PhotosN
ISO Speed
Shooting Situation
(No flash)
Flash Range
L (50), ISO 100 - ISO 400
Sunny outdoors
The higher the ISO speed, 
the farther the effective 
flash range will be.
ISO 400 - ISO 1600
Overcast skies or 
evening time
ISO 1600 - ISO 32000, 
H1 (51200), H2 (102400)
Dark indoors or night
You can also set the ISO speed with the [z2: ISO speed settings] menu’s 
[ISO speed] screen.