Canon Macro Twin Lite MT-24EX - Manual (Page 31)

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* C.Fn-8 and C.Fn-9 apply to the MT-24EX only.
C.Fn-4: If 1 is set and both flash tubes/heads are selected to fire with autoflash,
the modeling flash will be fired by both A and B at the same output. With
manual flash, the modeling flash will be fired according to the flash ratio
that was set.
C.Fn-5: If 1 is set, any slave units whose slave ID has been set to A or B will fire in
the same group as flash tube/head A or B set as the master unit.
C.Fn-6: If 1 is set and you press the camera’s depth-of-field preview button, you
can check the depth of field. The modeling flash cannot be fired.
Custom Function Settings
C.Fn Function No. Setting Description
1
Automatic cancellation
of FEB 0 Enabled
1 Disabled
2 FEB sequence
0
Standard exposure  Decreased
exposure  Increased exposure
1
Decreased exposure
 Standard
exposure
 Increased exposure
3 Flash metering mode
0 E-TTL II/E-TTL autoflash
1 TTL autoflash
4 Test firing button
0
E-TTL II/E-TTL autoflash: Full output
Manual flash: Fires at set output
1 Uniform modeling flash
5 Wireless control
0 Slave C only
1 Slaves A, B, and C
6 Modeling Flash
0 Enabled
1 Disabled
7
Flash recycling with
external power source
0
Recycle with both the MR-14EX/MT-
24EX and external power source
1
Recycle with the external power
source only
8 Flash ratio increments
0 1/2 stop
1 Full stop
9 Focusing lamp on/off
0 With focusing lamp button
1 Double-click shutter button
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