Canon EOS-1D Mark IV - Manual (Page 120)

V Flash Photography
Using Non-EX-series Canon Speedlites
• With an EZ/E/EG/ML/TL-series Speedlite set in TTL or A-TTL
autofiash mode, the fiash can be fired at fuii output oniy.
Set the camera’s shooting mode to
(manual exposure) or
< Av> (aperture-priority AE) and adjust the aperture setting before
shooting.
• When using a Speedlite which has manual flash mode, shoot in the
manual flash mode.
Using Non-Canon Flash Units
Sync Speed
The camera can synchronize with compact, non-Canon flash units at 1/300
sec. or 1/250 sec. or slower. With large studio flash units, since the flash
duration is longer than compactflash units, set the sync speed within 1/125
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.
i
If the camera is used with a flash unit or flash accessory dedicated to
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.
120