Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 31

Display &lt, >., High-speed Sync

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Using Fully Automatic Wireless Flash c High-speed Sync With the high-speed sync function, the flash can synchronize with all shutter speeds. This is convenient when you want to use aperturepriority AE for fill-flash portraits of a subject. 1 Display . Press function button 4 to display . 2 Display . Press function button 2 to display . Check that is lit in the viewfinder. 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, will not be displayed in the viewfinder. To return to normal flash shooting, press function button 2 to turn off . High-speed sync is not available during stroboscopic flash. 29

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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.