Canon EOS-1D X Mark III Advanced User's Manual page 411

[ ] Low-speed continuous shooting
When you hold down the shutter button completely, you can shoot continuously at max.
approx. 3.0 shots/sec. while you keep holding it down.
[ ( )] Single Soft shooting
Enables slower mirror movement and shutter cocking in viewfinder shooting than in
normal shooting.* No mechanical operation is performed until the shutter button returns
to the halfway-pressed position.
* Mechanical sounds are essentially the same as in normal shooting.
[ ( )] Soft continuous shooting
In viewfinder shooting, enables slower mirror movement and shutter cocking than when
set to < >.* You can shoot continuously at max. approx. 8.0 shots/sec. (Live
View shooting: max. approx. 10 shots/sec., or with [
[Mechanical], max. approx. 8.0 shots/sec.).
* Mechanical sounds are essentially the same as in normal shooting.
[ ( )] Soft low-speed continuous shooting
In viewfinder shooting, enables slower mirror movement and shutter cocking than when
set to < >.* You can shoot continuously at max. approx. 3.0 shots/sec.
* Mechanical sounds are essentially the same as in normal shooting.
[ ] ( ) Self-timer: 10 sec.
[ ] Self-timer: 2 sec.
For details on self-timer shooting, see Using the Self-Timer.
411
: Shutter mode] set to