Canon EOS 80D (W), Instruction Manual, Page: 249 / 526

249
Wireless Flash Photography
N
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.
1
Set [Wireless func.] to [
0
:
3
].

In step 5 on page 248, set [ Wireless
func. ] to [
0
:
3
].
2
Set the desired flash ratio and
take the picture.

Select [
1
:
2
] and set the flash ratio
within 8:1 to 1:1. Setting a flash ratio
to the right of 1:1 is not possible.
Fully Automatic Shooting with One External Speedlite and Built-in Flash

If the built-in flash output is not enough, set a higher ISO speed (p.148).

The 8:1 to 1:1 flash ratio is equivalent to 3:1 to 1:1 stops (1/2-stop
increments).