Canon EOS 70DN Basic Instruction Manual page 372

Using Wireless FlashN
Fully Automatic Shooting with One External Speedlite
and the Built-in Flash
If he built-in flash output is not enough, set a higher ISO speed (p.120).
The 8:1 to 1:1 flash ratio is equivalent to 3:1 to 1:1 stops (1/2-stop
increments).
208
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 look on the
subject.
1
Set [Wireless func.] to [0:3].
In step 5 on page 207, 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 poss ble.