Canon EOS 5D MARK II Instruction Manual page 19

Flash Photography
Using Non,Canon Flash Units
Sync Speed
The camera can synchronize with non-Canon compact flash units at 1/
200 sec. and slower speeds. With large studio flash units, since the
flash duration is longer, set the sync speed within 1/60 sec. to 1/30 sec.
Be sure to test the flash synchronization before shooting.
PC Terminal
®_ The camera's PC terminal can be
used with flash units having a sync
cord. The PC terminal is threaded to
prevent inadvertent disconnection.
_ The camera's PC terminal has no
polarity. You can connect any sync
cord regardless of its polarity.
Cautions for Live View shooting
When using a non-Canon flash unit for Live View shooting, set the [_':
Live View/Movie func. set.] menu's [Silent shoot.] to [Disable]
(p.113). The flash will not fire if it is set to [Mode 1] or [Mode 2].
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If Lhecamera is used with a flash unit or flash accessory dedicated [o
another camera brand, the camera may not operate properly and
malfunction may result.
Do not connect to the camera's PC terminal any flash unit requiring 250
V or more
Do not attach a high-voltage flash unit on the camera's hot shoe. It might
not fire.
] A flash unit attached to the camera's hot shoe and a flash unit connected to
the PC terminal can both be used at the same time.
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