Figure 4-53. Flash cntrl for built-in flash – Commander
mode
C – Commander Mode (see Figure 4-53) – This mode allows
your camera to become a commander or controller of up to
two banks of an unlimited number of external
CLS-compatible Speedlight flash units, with four available
channels (1-4).
In Figure 4-53, image 3, you’ll see Built-in flash, Group A
and B, and a Channel setting. Following Built-in flash and
Group A and B, you’ll see Mode and Comp. Use the Multi
Selector to move around and modify settings on this screen.
Here’s what they each mean.
Built-in flash – This lets you set the pop-up flash to one of
three settings. The settings do not affect any of the flash units
the Commander mode is controlling in Group A or B:
▪ TTL – Otherwise known as i-TTL mode, this is a
completely automatic Mode that does monitor
pre-flashes to determine correct exposure for the pop-up
flash. You can set compensation (Comp.) between +3.0
and -3.0 EV in 1/3 EV steps.
▪ M – This allows you to choose a manual flash level
between 1/1 (full power) to 1/128 (1/128 of full power).
▪ -- – I call this the double-dash mode. This disables the
pop-up flash from adding light to the image. The primary
light burst from the pop-up flash will not fire. However,
the pop-up flash still must fire the monitor pre-flashes to
determine a correct exposure and to communicate with
357
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