Canon 600EX User Manual

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Shooting with a slow shutter speed and second-curtain sync captures 
the trajectory of moving light sources, such as car lights, in a natural 
way. The flash fires right before the exposure finishes (shutter closes).
Display <r>.
 
Press function button 4 <Y> to 
display <r>.
r Second-curtain Sync
 
Second-curtain sync works well when the camera’s shooting mode is set 
to “buLb”.
 
To return to normal flash shooting, press function button 4 <Y> to 
turn off <r>.
 
When the flash mode is set to <a>, the flash fires twice. This first 
flash is a preflash to determine the flash output. It is not a malfunction.
 
Second-curtain sync is not available during wireless flash shooting.
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