Canon EOS-1D Mark IV - Manual (Page 122)

Setting the Flash
Functions settable under [Flash function settings]
On the screen, the settable functions and what’s displayed will
differ depending on the Speedlite, current flash mode, flash
Custom Function settings, etc.
To see which functions your Speedlite provides, refer to the Speediite's
instruction manuai.
• Flash mode
With an externai Speedlite, you can select the flash mode to suit
your flash shooting.
• [E-TTL II] is the standard mode of
EX-series Speediites for automatic
flash shooting.
• [Manual flash] is for users who want
to set the [Flash output] (1/1 to 1/
128) themselves.
• [MULTI flash] Is for users who want
to set the [Flash output],
[Frequency], and [Flash count]
themselves.
• For [TTL], [AutoExtFlash], and
[Man.ExtFlash], refer to the instruction
manual of the Speediites which
provide the respective flash mode.
Flash function settings
Flash mode » E - T T L i i
Manual flash
MULTI flash
B321 Clear flash settings
Shutter sync.
Normaliy, set this to [1st curtain] so that the flash fires immediately
after the exposure starts.
If [2nd curtain] is set, the flash wiil fire right before the shutter doses.
When this is combined with a slow sync speed, you can create a trail
of iight such as from car headiights at night. With 2nd curtain sync,
two flashes wiil be fired: Once when you press the shutter button
completeiy, and once immediateiy before the exposure ends,
if [Hi-speed] is set, the flash can be used with aii shutter speeds.
This is especiaily effective for portraits using fili flash when you want
to give priority to the aperture setting.
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