Canon Eos Rebel T6i 750d Instruction Manual

							181
Using Wireless FlashK
The tables below show the possible configurations for wireless flash 
shooting. Choose the configuration suiting the subject, shooting 
conditions, the number of external Speedlites you use, etc.
Wireless Flash Shooting Configurations
External SpeedliteBuilt-in  FlashPageSetting
QuantityA:B Flash 
RatioWireless 
FunctionsFiring Group
Fully 
Automatic 
(E-TTL II 
autoflash) Single
- - p.182 01 All
Single -Used p.185 0:3 -
Multiple - - p.184 01 All
Multiple Set - p.18701(A:B)
Multiple -Used
p.188 0
+31  All and 2
Multiple Set Used 0+31 (A:B)2
• Flash exposure  compensation p.189
• FE lock
External SpeedliteBuilt-in  FlashPageSetting
QuantityA:B Flash 
RatioWireless FunctionsFiring Group
Manual  Flash Single/
Multiple --
p.19001
 All
Multiple Set -01(A:B)
Single/
Multiple -
Used 0+31  All and 2
Multiple Set Used 0+31 (A:B)2
Even if you disable the built-in flash from firing, it will still fire in order 
to control the slave unit via optical transmission.  The flash fired to 
control the slave unit may therefore appear in the picture depending on the 
shooting conditions. 
						

							182
The basics of easy, fully automatic wireless flash shooting are explained below.
Steps 1 to 4 and 6 apply to all 
wireless flash shooting. Therefore, 
these steps are omitted in other 
wireless flash setups explained on 
the pages hereafter.
1Press the  button to raise the 
built-in flash.
 For wireless flash shooting, be sure 
to raise the built-in flash.
2Select [Flash control].
Under the [z 1] tab, select [Flash 
control ], then press < 0>.
3Select [Evaluative].
 For [ E-TTL II meter. ], select 
[Evaluative], then press < 0>.
Easy Wireless Flash Shooting K
Fully Automatic Shooting with One External Speedlite 
						

							183
Easy Wireless Flash ShootingK
4Select [Built-in flash settings].
Select [ Built-in flash settings], then 
press < 0>.
5Select [EasyWireless].
 For [ Built-in flash ], select 
[EasyWireless ], then press .
6Set [Channel].
 Set the transmission channel (1-4) to 
the same one as the slave unit.
7Take the picture.
Set the camera and take the picture 
in the same way as with normal 
shooting.
8Exit the wireless flash shooting.
For [ Built-in flash ], select 
[NormalFiring ].
Setting [ E-TTL II meter. ] to [Evaluative] is recommended.
 Even though the firing of the built-in flash is disabled when 
[EasyWireless ] is set, it will still fire a small flash in order to control the 
slave unit. Depending on shooting condit ions, the flash fired to control 
the slave unit may appear in the picture.
 Firing a test flash is not possible with the slave unit. 
						

							Easy Wireless Flash ShootingK
184
You can have multiple slave units fire  as if they were a single Speedlite. 
This is convenient when you need a large flash output.
Basic settings:
Flash mode : E-TTL II
E-TTL II meter. : Evaluative
Built-in flash : EasyWireless
Channel :  (Same as slave units)
All the slave units will fire at the same 
output and be controlled to obtain a 
standard exposure.
No matter which firing group (A, B, or C) 
the slave units belong to, they will all fire 
as one group.
If the flash exposure looks too dark or too bright, you can set flash 
exposure compensation to adjust  the slave units’ flash output.
 Select [ 1exp. comp. ], then press 
< 0 >.

If the flash exposure is too dark, press the 
<
Z> key to increase the flash exposure 
and make it brighter. If the flash exposure is 
too bright, press the <
Y> key to decrease 
the flash exposure and make it darker.
Fully Automatic Shooting with Multiple External Speedlites
Flash Exposure Compensation 
						

							185
This is fully automatic wireless flash 
shooting with one external Speedlite and 
the built-in flash.
You can change the flash ratio between 
the external Speedlite and built-in flash 
to adjust how the shadows cast on the 
subject.
On the menu screens, the  and 
< 1 > icons indicate the external 
Speedlite, and the < 3> and < 2> 
icons indicate the built-in flash.
1Select [CustWireless].
 Follow step 5 on page 183 to select 
[CustWireless], then press < 0>.
2Select [Wireless func.].
 For [ Wireless func. ], select [0:3 ], 
then press < 0>.
3Set the desired flash ratio and 
take the picture.
 Select [ 0:3 ] and set the flash ratio 
within 8:1 to 1:1. Setting a flash ratio 
to the right of 1:1 is not possible.

If the built-in flash output is not enough, 
set a higher ISO speed (p.122).
Custom Wireless Flash Shooting K
Fully Automatic Shooting with One External Speedlite and Built-in Flash
The 8:1 to 1:1 flash ratio is equivalent to 3:1 to 1:1 stops (1/2-stop increments). 
						

							Custom Wireless Flash ShootingK
186
Multiple Speedlite slave units can be fired as one flash unit, or 
separated into slave groups for shooting with flash ratio control.
The basic settings are shown below. By changing the [ Firing group] 
setting, you can shoot with various wi reless flash setups with multiple 
Speedlites.
Basic settings:
Flash mode : E-TTL II
E-TTL II meter. : Evaluative
Wireless func. : 0
Channel :  (Same as slave units)
[ 1 All] Firing multiple slave Speedlites as one flash unit
Convenient when you need a large flash 
output. All the slave units will fire at the 
same output and be controlled to obtain 
a standard exposure.
No matter which firing group (A, B, or C) 
the slave units belong to, they will all fire 
as one group.
Set [Firing group] to [1All], then 
take the picture.
Fully Automatic Shooting with Multiple External Speedlites 
						

							187
Custom Wireless Flash ShootingK
[1  (A:B)] Firing multiple slave units in multiple groups
You can divide the slave units into 
groups A and B, and change the flash 
ratio to obtain the desired lighting effect.
Refer to the Speedlite’s instruction 
manual and set one slave unit to firing 
group A and the other to firing group B. 
Position the Speedlites as shown in the 
illustration.
1Select [Wireless func.].
Follow step 2 on page 185 to select 
[0 ], then press < 0>.
2Set [Firing group] to [1  (A:B)].
3Set the A:B flash ratio and shoot.
Select [ A:B fire ratio ] and set the 
flash ratio.
A  B 
If [Firing group ] is set to [1 (A:B) ], group C will not fire.
The 8:1 to 1:1 to 1:8 flash ratio is equivalent to 3:1 to 1:1 to 1:3 stops (1/2-
stop increments). 
						

							Custom Wireless Flash ShootingK
188
The built-in flash can also be added to  wireless flash shooting explained 
on pages 186-187.
The basic settings are shown below. By changing the [ Firing group] 
setting, you can shoot with various wireless flash setups of multiple 
Speedlites complemented with the built-in flash.
1Basic settings:
Flash mode : E-TTL II
E-TTL II meter. : Evaluative
Wireless func. : [ 0+3 ]
Channel :  (Same as slave units)
2Select [Firing group].
Select the firing group, then set the 
flash ratio, flash exposure 
compensation, and other necessary 
settings before shooting.
Fully Automatic Shooting with the Built-in Flash and Multiple External Speedlites
A  B 
[1  (A:B)  2 ]
[ 1  All and  2 ] 
						

							189
Custom Wireless Flash ShootingK
When [Flash mode] is set to [E-TTL II], flash exposure compensation 
can be set. The flash exposure compensation settings (see below) 
which can be set vary depending on the [ Wireless func.] and [Firing 
group ] settings.
[Flash exp. comp.]
The set amount of flash exposure 
compensation will be applied to the 
built-in flash and all the external 
Speedlites.
[2  exp. comp.]
Flash exposure compensation is 
applied only to the built-in flash.
[1  exp. comp.]
The set amount of flash exposure 
compensation will be applied to all 
the external Speedlites.
If [ Flash mode ] is set to [E-TTL II], you can press the  button to 
perform FE lock.
Flash Exposure Compensation
FE Lock 
						

							Custom Wireless Flash ShootingK
190
When [Flash mode] is set to [Manual flash ], flash exposure can be set 
manually. The flash output settings that can be set ([1 flash output ], 
[Group A output], etc.) vary depending on the [ Wireless func.] setting 
(see below).
[Wireless func. 0]
[Firing group: 1 All]:
The manual flash output setting is 
applied to all the external Speedlites.
 [Firing group: 1  (A:B)]:
You can set the flash output 
separately for slave groups A and B.
[Wireless func. 0+3 ]
[Firing group: 1 All and 2]:
The flash output can be set 
separately for the external 
Speedlite(s) and built-in flash.
 [Firing group: 1  (A:B)2]:
You can set the flash output 
separately for slave groups A and B. 
You can also set the flash output for 
the built-in flash.
Setting the Flash Output Manual ly for Wireless Flash Shooting