Canon Speedlite Transmitter ST-E3-RT - Manual (Page 31)

29
Using Fully Automatic Wireless Flash
With the high-speed sync function, the flash can synchronize with all
shutter speeds. This is convenient when you want to use aperture-
priority AE for fill-flash portraits of a subject.
1
Display <P>.
Press function button 4 to display
<P>.
2
Display <c>.
Press function button 2 <Y> to
display <c>.
Check that <F> is lit in the
viewfinder.
c High-speed Sync
When using the transmitter with EOS cameras compatible with E-TTL
and released up to 2011, high-speed sync is not possible with radio
transmission wireless flash shooting (p.19).
With high-speed sync, the faster the shutter speed, the shorter the
effective flash range will be.
If you set a shutter speed that is equal to or slower than the camera’s
maximum flash sync speed, <F> will not be displayed in the viewfinder.
To return to normal flash shooting, press function button 2 <Y> to
turn off <c>.
High-speed sync is not available during stroboscopic flash.
COP
Y