Canon Speedlite 600EX-RT - Manual (Page 28)

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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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