Flash Tab
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Force TTL Master Mode (Canon Only):
Canon Only
This mode enables the use of a Speedlite that lacks Master Mode in the shoe of a ControlTL transmitter to trigger
remote flashes. The transmitter tells the camera that Master Mode is active even though that mode is not available or
set in the flash. All TTL remotes will operate as one zone of light when used this way.
This also benefits the 580EX (I and II) as it will emit fewer communication flashes. This reduces the "flickering
pre-flash" that bothers some subjects. All flash controls remain active including the ability to adjust remote flash
power from a 580EX. If you wish to retain the ability to toggle on and off your remote flashes using the control on
your 580EX or 580EX II when not in ratio mode, you will need to uncheck "Force TTL Master Mode."
Pre-Flash Boost Mode (Canon Only):
Canon Only
In certain TTL situations, especially when shooting in full sun or over long distances, the normal pre-flash is simply
not enough for the camera to see. When Pre-Flash Boost is engaged, you get a pre-flash that is two stops brighter.
This will approximately double the distance that the camera can make sense of the TTL pre-flash information, or
help compensate for the reduced output caused by a light modifier or bounced flash.
This setting has three options:
Disable Pre-Flash Boost: (Default Setting) This turns Pre-flash Boost off completely and uses native power levels
for preflashes.
Auto Pre-Flash Boost: Selecting this option enables Pre-Flash Boost whenever the flash head is rotated in any
direction other than the standard 90º position. In the standard 90º flash head position, Pre-Flash Boost will not be
used.
Enable Pre-Flash Boost: Selecting this option enables Pre-Flash Boost full-time (helpful when using diffusers).
Remote Beeper:
Determines what settings the remote flash's ready beeper will use the next time you half-press the camera's shutter
release. Note that this control affects studio strobes only, and will not have any effect on Canon or Nikon
speedlights.
Remote Optical Trigger:
Determines what settings the remote flash's optical trigger will use the next time you half-press the camera's shutter
release. Note that this control affects studio strobes only, and will not have any effect on Canon or Nikon
speedlights.
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