Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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3

 Setting the Flash FunctionN

 

Normally, set this to [First-curtain 
synchronization] so that the flash fires 
immediately after the exposure starts.

If [Second-curtain synchronization] is set, the flash will be fired 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. When second-curtain synchronization is set 
together with [ETTL II], the flash will be fired twice in a row: once when 
you press the shutter button completely and once right before the end 
of the exposure.
If [High-speed synchronization] is set, the flash can be used at all 
shutter speeds. This is effective when you want to shoot with 
background blur (open aperture) in locations such as outdoors in 
daylight.

 

You can set flash exposure 
compensation up to ±3 stops in 1/3-stop 
increments.
For details, refer to the Speedlite’s 
Instruction Manual.

 

While changing the flash output 
automatically, three shots will be taken.
For details, refer to the Instruction 
Manual of a Speedlite equipped with 
flash exposure bracketing.