Canon Eos Rebel T6i 750d Instruction Manual

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Basically operates like a built-in flash for easy operation.
When an EX-series Speedlite (sold separately) is attached to the 
camera, almost all the autoflash control is done by the camera. In other 
words, it is like a high-output flash attached externally in place of the 
built-in flash.
For detailed instructions, refer to the EX-series Speedlite’s 
instruction manual.  This camera is a Type-A camera that can use all 
the features of EX-series Speedlites.
D  Using an External Speedlite
EOS-dedicated, EX- series Speedlites
Shoe-mount Speedlites Macro Lites
With an EX-series Speedlite not compatible with flash function settings 
(p.173), only [ Flash exp. comp ] and [E-TTL II meter. ] can be set for 
[ External flash func. setting ]. ([Shutter sync. ] can also be set with 
certain EX-series Speedlites.)
 If flash exposure compensation is set with the external Speedlite, the 
flash exposure compensation icon  displayed on the camera’s LCD 
monitor will change from  y to 0 . 
						

							D Using an External Speedlite
172
With an EZ/E/EG/ML/TL-series Speedlite set in TTL or A-TTL 
autoflash mode, the flash can be fired at full output only.
Set the camera’s shooting mode to < a> (manual exposure) or 
< f > (aperture-priority AE) and adjust the aperture setting before 
shooting.
 When using a Speedlite that has ma nual flash mode, shoot in the 
manual flash mode.
Sync Speed
The camera can synchronize with  compact, non-Canon flash units at 
1/200 sec. or slower shutter s peeds. Use a sync speed slower than 
1/200 sec.
Be sure to test the flash unit beforehand to make sure it synchronizes 
properly with the camera.
Cautions for Live View Shooting
A non-Canon flash will not fire during Live View shooting.
Canon Speedlites Other Than the EX-series
Using Non-Canon Flash Units
 If the camera is used with a flash unit or flash accessory dedicated to 
another camera brand, the camera may not operate properly and 
malfunction may result.
 Do not attach a high-voltage flash unit on the camera’s hot shoe. It may 
not fire. 
						

							173
With the built-in flash or an EX-series, external Speedlite compatible 
with flash function settings, you can use the camera’s menu to set flash 
functions and the external S peedlite’s Custom Functions. 
If you use an external Speedlite, attach the Speedlite to the camera 
and turn on the Speedlite before setting the flash functions.  For 
details on the external Speedlite’ s flash functions, refer to the 
Speedlite’s instruction manual.
Select [Flash control].
Under the [z 1] tab, select [Flash 
control ], then press < 0>.
 The Flash control screen will appear.
 Normally, set this to [Enable ].
 If [Disable] is set, neither the built-
in flash nor the external Speedlite 
will fire.  This is useful when you want 
to use only the flash’s AF-assist 
beam.
 For normal flash exposures, set this 
to [Evaluative ].
 [Average ] is for advanced users. As 
with an external Speedlite, the 
metering area is averaged. Flash 
exposure compensation may be 
necessary.
3  Setting the Flash K
[Flash firing]
[E-TTL II meter.]
Even if [Flash firing] is set to [Disable ], if focus is difficult to achieve in low 
light, the flash may still fire a series of flashes (AF-assist beam, p.103). 
						

							3 Setting the Flash K
174
You can set the flash-sync speed for 
flash photography in the aperture-priority 
AE (f) mode.
 N : Auto
The flash sync speed is set automatically within a range of 1/200 
sec. to 30 sec. to suit the scene’s brightness. High-speed sync is 
also possible.
 V : 1/200-1/60 sec. auto
Prevents a slow shutter speed from  being set in low-light conditions. 
It is effective for preventing subject blur and camera shake. 
However, while the subject will  be properly exposed with the flash, 
the background may come out dark.
 W : 1/200 sec. (fixed)
The flash-sync speed is fixed at  1/200 sec. This more effectively 
prevents subject blur and camera shake than with [ 1/200-1/60sec. 
auto ]. However, in low light, the subject’s background will come out 
darker than with [ 1/200-1/60sec. auto ].
[Flash sync. speed in Av mode]
If [1/200-1/60sec. auto ] or [1/200 sec. (fixed) ] is set, high-speed sync is not 
possible in the < f> mode with the external Speedlite. 
						

							175
3 Setting the Flash K
When you use the built-in flash or an 
external, EX-series Speedlite compatible 
with flash function settings, you can 
press the  button to directly display 
the [Built-in flash settings ] or [External 
flash func. setting ] screen without first 
displaying the menu screen.
 With built-in flash
Press the  button twice.
The built-in flash will be raised.
 Press the button again to display the 
[Built-in flash settings ] screen.
 With external Speedlite
Press the  button.
With the external Speedlite turned on, 
press the < D> button to display the 
[External flash func. setting ] 
screen.
Displaying the Flash Functio n Setting Screen Directly
When you press the < D> button to display the flash function setting 
screen, you cannot set [ Flash firing], [E-TTL II meter. ], [Flash sync. 
speed in Av mode ], or [External flash C.Fn setting ]. Set these 
functions with [ z1: Flash control ] instead.
 If [Flash firing] is set to [Disable ] and you press the  button, the 
[ z 1: Flash control ] screen will appear. 
						

							3 Setting the Flash K
176
You can set the functions in the table below. The functions displayed under 
[
External flash func. setting] vary depending on the Speedlite model.
Select [ Built-in flash settings] or 
[External flash func. setting ].
 The flash function setting screen will 
be displayed. With [ Built-in flash 
settings ], only the highlighted 
functions can be selected and set.
Main Functions for [Built-in flash settings] and [External flash func. settings]
*For [ FEB] (Flash exposure bracketing) and [ Flash zoom], refer to the instruction 
manual of a Speedlite compatible with the functions.
[Built-in flash settings] and  [External flash func. setting]
Function
[Built-in flash settings ][External 
flash func.  setting ]PageNormal 
FiringEasy 
Wireless (p.182)Custom 
Wireless (p.185)
Flash modekk177Shutter 
synchronization kk
177
FEB*kWireless functionskk177Flash exposure 
compensation kkk k
168
Flash ratio controlkMaster flash firingkFlash zoom*k
[Built-in flash settings ][External flash func. setting ]
Flash mode
Flash zoom 
(Flash coverage)
Flash exposure 
compensation
Wireless functions
Shutter 
synchronization
FEB
Sample screen 
						

							177
3 Setting the Flash K
Flash mode
When using an external Speedlite, y ou can select the flash mode to 
suit your desired flash shooting.
[E-TTL II ] is the standard mode of 
EX-series Speedlites for automatic 
flash shooting.
 [Manual flash ] is for advanced users 
who want to set the [ Flash output] 
(1/1 to 1/128) themselves.
 Regarding other flash modes, refer to 
the instruction manual of a Speedlite 
compatible with the functions.
 Shutter synchronization
Normally, set this to [ 1st curtain] so that the flas h fires immediately 
after the exposure starts.
If [2nd curtain ] is set, the flash will fire right before the shutter closes. 
When this is combined with a slow shutter speed, you can create a trail 
of light such as from car headlights at night with a more natural feel. 
With E-TTL II (auto flash exposure), two flashes will be fired: once when 
you press the shutter button completely, and once immediately before 
the exposure ends. Also, if the shutter speed is 1/30 sec. or faster, first-
curtain synchronization will be applied automatically.
If an external Speedlite is attached, you can also select [ High-speed 
synchronization ] (e ). For details, refer to the Speedlite’s 
instruction manual.
 Wireless functions
When performing optical transmissi on wireless flash shooting using 
the master function of the built-in  flash, see “Using Wireless Flash” 
on page 179. When performing wireless flash shooting with radio or 
optical transmission using the ma ster function of the external 
Speedlite, refer to the Speedlite’s instruction manual.
 Flash exposure compensation
See “Flash Exposure Compensation” on page 168. 
						

							3 Setting the Flash K
178
The Custom Functions displayed under [ External flash C.Fn setting] 
vary depending on the Speedlite model.
1Display the Custom Function.
 With the camera ready to shoot with 
an external Speedlite, select 
[External flash C.Fn setting ], then 
press < 0>.
2Set the Custom Function.
Press the   keys to select the 
function number, then set the function. 
The procedure is the same as setting the 
camera’s Custom Functions (p.336).
1Select [Clear settings].
 Under the [z 1: Flash control ] tab, 
select [Clear settings], then press 
< 0 >.
2Select the settings to be cleared.
Select [Clear built-in flash set.], 
[
Clear external flash set.], or [Clear 
ext. flash C.Fn set.
], then press . When you select [ OK], the respective 
flash settings will be cleared.
Setting the External Speedlite Custom Functions
Clearing the Settings
With an EX-series Speedlite, if the [Flash metering mode] Custom Function is 
set to [TTL flash metering] (autoflash), the Speedlite will always fire at full output.
The Speedlite’s Personal Function (P.F n) cannot be set or canceled with the 
camera’s [ Flash control ] screen. Set it with the Speedlite. 
						

							179
The camera’s built-in flash can work as a master unit for Canon EX-
series, external Speedlites having a wireless slave feature. It can 
wirelessly trigger the Speedlite(s)  to fire via optical transmission.
Be sure to read the instructions and cautions about wireless flash 
photography (optical transmission) in the Speedlite’s instruction 
manual.
Regarding your Speedlite (slave unit),  refer to its instruction manual and 
set it as follows. The settings other than the ones below for the slave 
unit’s control are all set with the camera. Different types of Speedlite 
slave units can be used and controlled together.
(1) Set the external Speedlite as a slave unit.
(2) Set the Speedlite’s transmission channel to the same channel  as set on the camera.
*1
(3) For flash ratio control  (p.187), set the slave unit’s firing group.
(4) Position the camera and slave unit(s) within the range shown  below.
(5) Face the slave unit’s wireless sensor toward the camera.
*2
Using Wireless Flash K
Slave Unit Settings and Position
Example of Wireless Flash Set-up
Indoors
OutdoorsApprox. 10 m/32.8 ft.
Approx. 7 m/23.0 ft.
Approx. 80°
Approx. 5 m/
16.4 ft. Approx. 7 m/
23.0 ft. 
						

							Using Wireless FlashK
180
*1: If the Speedlite does not have a transmission channel setting function, it 
operates regardless of the channel set on the camera.
*2: In small rooms, the slave unit may work even if its wireless sensor does not face  the camera. The camera’s wireless signals can bounce off the walls and be 
received by the slave unit. When using an EX-series Speedlite with fixed light-
emitting unit (flash head) and wireless sensor, take pictures while making sure it 
can fire.
Canceling the slave unit’s auto power off
To cancel the slave unit’s auto power off, press the camera’s  
button. If you are using manual flash firing, press the slave unit’s test 
firing (PILOT) button to cancel the auto power off.
The camera’s master function cannot be used for wireless flash shooting 
with radio transmission.