Canon EOS 5DS Instruction Manual page 252

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3 Setting the FlashN

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 [Second-curtain

synchronization] is set.

With an EX-series Speedlite not compatible with flash function settings,

you can only set the following: [Flash firing], [E-TTL II meter.], and

[Flash exposure compensation] under [Flash function settings].

([Shutter synchronization] can also be set with certain EX-series

Speedlites.)

If flash exposure compensation is set with the Speedlite, you cannot set

the flash exposure compensation with the camera. If it is set with both

the camera and Speedlite, the Speedlite's setting overrides the camera's.