Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 430)

3 Custom Function Settings
430
Set shutter speed range C.Fn3
You can set the shutter speed range. In the < s > and < a > modes,
you can set the shutter speed manually within the range you have set.
In the <
d > and < f > modes, the shutter speed will be set
automatically within the set shutter speed range (except for movie
shooting). Then select [
OK ] to register the setting.
Highest speed
You can set it from 1/8000 sec. to 15 sec.
Lowest speed
You can set it from 30 sec. to 1/4000 sec.
Set aperture range C.Fn3
You can set the aperture range. In the < f >, < a >, and < bulb >
modes, you can set the aperture manually within the range you have
set. In the <
d > and < s > modes, the aperture will be set
automatically within the set aperture range (except for movie
shooting). Then select [
OK ] to register the setting.
Min. aperture (Max. f/)
You can set it from f/91 to f/1.4.
Max. aperture (Min. f/)
You can set it from f/1.0 to f/64.
The settable aperture range varies depending on the lens’s maximum and
minimum apertures.