Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 169)

Slow Synchro
You can set the flash-sync speed for flash photography in [ ] or [ ] mode. Note that the
maximum flash synchronization speed varies depending on the [ : Shutter mode ] setting.
It is 1/250 sec. when set to [ Elec. 1st-curtain ] and 1/200 sec. when set to [ Mechanical ].
: 1/250-30sec. auto ( : 1/200-30sec. auto)
The shutter speed is set automatically within a range of 1/250 (or 1/200) sec. to 30 sec.
to suit the brightness. High-speed sync is also possible.
: 1/250-1/60sec. auto ( : 1/200-1/60sec. auto)
Prevents a slow shutter speed from being set automatically in low-light conditions. It is
effective for preventing subject blur and camera shake. Light from the flash provides
standard exposure for subjects, but note that backgrounds may be dark.
: 1/250 sec. (fixed) ( : 1/200 sec. (fixed))
The shutter speed is fixed at 1/250 sec. (or 1/200 sec.), which is more effective in
preventing subject blur and camera shake than with [
1/250-1/60sec. auto ] (or
[ 1/200-1/60sec. auto ]). Note that under low light, backgrounds will be darker than with
[ 1/250-1/60sec. auto ] (or [ 1/200-1/60sec. auto ]).
Caution
High-speed sync is not available in [ ] or [ ] mode when set to [ 1/250 sec.
(fixed) ] or [ 1/200 sec. (fixed) ].
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