High-Speed Sync; Second-Curtain Sync - Canon Macro Ring Lite MR-14EX Mode D'emploi

c High-speed sync
With high-speed sync (FP flash), the flash can synchronize with all
shutter speeds.
If the shutter speed is slower than the maximum flash sync speed, <F>
will not be displayed in the viewfinder.
To return to normal flash, press the <h> and <i> buttons
simultaneously to turn off <c>.
With high-speed sync, the faster the shutter speed, the shorter the flash
range will become.
r Second-curtain sync
With a slow shutter speed, you can create a light trail following the
subject. The flash fires right before the shutter closes.
The camera's "buLb" mode works well with second-curtain sync.
To return to normal flash, press the <h> and <i> buttons
simultaneously to turn off <r>.
With E-TTL II/E-TTL, two flashes will be fired even at slow shutter
speeds. The first flash is the preflash.
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Select <c>.
Press the <h> and <i> buttons
simultaneously to display <c>.
In the viewfinder, check that the <F>
icon is lit.
Select <r>.
Press the <h> and <i> buttons
simultaneously to display <r>.