Canon MT-26EX-RT Macro Twin Lite - Manual (Page 43)

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With high-speed sync, you can shoot with a flash at all shutter speeds.
This is effective when you want to shoot in the aperture-priority AE
<
f > mode with background blur (by opening the aperture) in
locations such as outdoors in daylight.
Display < c >.
Press function button 4 < Y > to
display < c >.
Check that < F > is lit in the
viewfinder, then shoot.
c High-speed Sync
N
With high-speed sync, the faster the shutter speed, the lower the guide
number becomes.
When the shutter speed is less than or equal to the maximum flash sync
shutter speed, <
F > is not displayed in the viewfinder.
To return flash firing to normal, press function button 4 < Y > to turn
off < c >.