Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 167)

167
i : Setting the ISO Speed for Still Photos
You can set the automatic ISO speed range for ISO Auto within ISO 100
- ISO 51200. You can set the minimum limit within ISO 100 - ISO 25600,
and the maximum limit within ISO 200 - ISO 51200 in 1-stop
increments.
1
Select [Auto range].
2
Set the minimum limit.
Select the minimum limit box, then
press <
0 >.
Select the ISO speed, then press
<
0 >.
3
Set the maximum limit.
Select the maximum limit box, then
press <
0 >.
Select the ISO speed, then press
<
0 >.
4
Select [OK].
3 Setting the ISO Speed Range for ISO Auto
The [ Minimum ] and [ Maximum ] settings will also be applied to the ISO
speed safety shift’s minimum and maximum ISO speeds (p.426).