Canon 600EX-RT User Manual

Page of 372
25
With high-speed sync, 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.
Display <c>.
 
Press function button 4 <Y> to 
display <c>.
 
Check that <F> is lit in the 
viewfinder.
c High-speed Sync
 
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 4 <Y> to 
turn off <c>.
 
High-speed sync is not available during stroboscopic flash.
 
When using the flash 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.51).
 
With high-speed sync, the faster the shutter speed, the shorter the 
effective flash range will be. Check the effective flash range on the LCD 
panel.
COP
Y