Canon EOS 5Ds Instruction Manual page 251

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Shutter synchronization

If [Second-curtain synchronization] 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.

If [High-speed synchronization] is set, the flash can be used at all

shutter speeds. This is convenient when you want to shoot with

background blur (open aperture) in locations such as outdoors in

Flash exposure compensation

Flash exposure bracketing

Normally, set this to [First-curtain

synchronization] so that the flash fires

immediately after the exposure starts.

You can set flash exposure

compensation up to ±3 stops in 1/3-stop

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.

3 Setting the FlashN