Canon Macro Ring Lite MR-14EX II - Manual (Page 32)

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With high-speed sync, the flash can synchronize with all shutter
speeds. This is convenient when you want to shoot in the aperture-
priority AE (f) mode (open aperture) with background blur.
Display <
c>.
Press function button 4 < Y> to
display < c>.
Check that < F> is lit in the
viewfinder.
c High-speed SyncN
With high-speed sync, the faster the shutter speed, the lower the guide
number will be.
If the set shutter speed is slower than the maximum flash sync speed,
<
F> is not displayed in the viewfinder.
To return to normal flash shooting, press function button 4 < Y> to
turn off < c>.
COP
Y