Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 261)

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D Flash Photography
With an EZ/E/EG/ML/TL-series Speedlite set to A-TTL or TTL
autoflash mode, the flash can be fired at full output only.
Set the camera’s shooting mode to manual exposure < a > or
aperture-priority AE < f > and adjust the aperture setting before
shooting.
When using a Speedlite that has manual flash mode, shoot in the
manual flash mode.
Sync Speed
The camera can synchronize with non-Canon compact flash units at
1/250 sec. and slower speeds. With large studio flash units, the flash
duration is longer than that of a compact flash unit and varies
depending on the model. Be sure to check before shooting if flash
sync is properly performed by test shooting at a sync speed of
approx. 1/60 sec. to 1/30 sec.
PC Terminal
The camera’s PC terminal can be
used with flash units having a sync
cord. The terminal has locking
threads to prevent the cord from
falling off.
The camera’s PC terminal has no
polarity. You can connect any sync
cord regardless of its polarity.
Cautions for Live View Shooting
If you use a non-Canon flash unit with Live View shooting, set [ z 5:
Silent LV shoot. ] to [ Disable ] (p.281). The flash will not be fired if it
is set to [ Mode 1 ] or [ Mode 2 ].
Canon Speedlites Other Than the EX-series
Non-Canon Flash Units