Canon EOS 7D Mark II Wi-Fi Adapter Kit Handbuch

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 Setting the FlashN
266
 
Shutter synchronization
Normally, set this to [1st curtain] so that 
the flash fires immediately after the 
exposure starts.
If [2nd curtain] is set, the flash will fire right before the shutter closes. 
When this is combined with a slow shutter speed, you can create a trail 
of light such as from car headlights at night with a more natural feel. 
With second-curtain synchronization, two flashes will be fired: once 
when you press the shutter button completely, and once immediately 
before the exposure ends.
 
2
 Flash exposure compensation
You can set flash exposure 
compensation up to ±3 stops in 1/3-stop 
increments.
 
Wireless functions
With wireless flash photography (via 
optical transmission), you can use the 
built-in flash to wirelessly control external 
Speedlites.
For details, see “Using Wireless Flash” 
on page 272.
When using second-curtain synchronization, set the shutter speed to 1/25 
sec. or slower. If the shutter speed is 1/30 sec. or faster, first-curtain 
synchronization will be applied automatically even if [2nd curtain] is set.