Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 181)

181
Wireless Flash Photography Using Optical Transmission
Methods of Wireless Flash Photography Using Optical
Transmission
External Speedlite
Built-in
Flash
Page
Settings
No. of
Units
A:B
Firing
Ratio
Wireless
Functions
Firing Group
Fully
automatic
shooting
(E-TTL II
autofl ash)
1 ― ― = 182
0 1
All
1 ― Used = 184
0
:
3
―
Multiple ― ― = 185
0 1
All
Multiple Settings ― = 186
0 1
(A:B)
Multiple ― Used
= 187
0
+
3 1
All and
2
Multiple Settings Used
0
+
3 1
(A:B)
2
• Flash exposure compensation
= 188
• FE lock
External Speedlite
Built-in
Flash
Page
Settings
No. of
Units
A:B
Firing
Ratio
Wireless
Functions
Firing Group
Manual
fl ash
1/multiple ― ―
= 189
0 1
All
Multiple Settings ―
0 1
(A:B)
1/multiple ― Used
0
+
3 1
All and
2
Multiple Settings Used
0
+
3 1
(A:B)
2
*
0
/
1
: external Speedlite;
3
/
2
: built-in fl ash
o
To control receivers optically, the built-in fl ash fi res even when you have set it
to disable fi ring.