Canon EOS 80D - Manual (Page 241)

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3 Setting the FlashN
 Wireless functions / Flash ratio control
Wireless (multiple) flash shooting is
possible with radio or optical
transmission.
For details on wireless flash, refer to the
instruction manual of a Speedlite
compatible with wireless flash shooting.
With a macro flash (MR-14EX II, etc.)
compatible with flash function settings,
you can set the flash ratio between flash
tubes or flash heads A and B, or perform
wireless flash with additional slave units.
For details on flash ratio control, refer to
the macro flash’s instruction manual.
 Flash zoom (Flash coverage)
With Speedlites having a zooming flash
head, you can set the flash coverage.
Normally, set this to [AUTO] so that the
camera will automatically set the flash
coverage to match the lens focal length.
 Shutter synchronization
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 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. When second-curtain synchronization is set together with [E-
TTL 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 useful when you want to shoot with background
blur (open aperture) in locations such as outdoors in daylight.