Canon Speedlite 600EX II-RT Manual (en)

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You can set the flash output from 1/1 full output to 1/128 power in 1/3-
step increments.
Use a flash meter (commercially-available) to determine the required 
flash output to obtain a correct flash exposure. Setting the camera’s 
shooting mode to <f> or <q> is recommended.
1
Set the flash mode to <q>.
 
Press the <E> button.
 
Turn <9> to select <R>, then 
press <8>.
2
Set the flash output. 
 
Press function button 2 <@>.
X
The flash output level is highlighted.
 
Turn <9> to set the flash output, 
then press <8>.
 
When you press the camera’s shutter 
button halfway, an indication of the 
shooting distance and the aperture 
value are displayed.
q: Manual FlashN
Shooting distance
Aperture
 
For guide number details with manual flash, see page 137.
 
The flash output can be set directly by turning <9> without pressing the 
<@> button (C.Fn-13/p.116).