3 Setting the FlashN
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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.