Canon EOS 80D Instruction Manual page 249

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).
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.
Set [Wireless func.] to [0:3].
1
In step 5 on page 248, set [Wireless

func.] to [0:3].
Set the desired flash ratio and
2
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.
Wireless Flash PhotographyN
249