Canon Speedlite 600EX II-RT Manual (en)

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//.: Flash External MeteringN
You can manually set the Speedlite with the ISO speed and aperture set 
on the camera. The flash output is automatically adjusted according to 
the ISO speed and aperture that you set.
1
Set the flash mode to <.>.
 
Press the <E> button.
 
Turn <9> to select <s>, then 
press <8>.
2
Set the same ISO speed as on the 
camera.
 
Press function button 3 <I>.
X
The ISO speed value is highlighted.
 
Turn <9> to set the ISO speed, then 
press <8>.
 
ISO speed can be set within a range of 
ISO 25 to ISO 51200, in 1/3 increments.
3
Set the same aperture as on the 
camera.
 
Press function button 4 <D>.
X
The aperture is highlighted.
 
Turn <9> to set the aperture value, 
then press <8>.
 
The effective flash range 
corresponding to the preset ISO 
speed and aperture value is displayed.
.: Manual External Flash Metering
ISO speed
Aperture
 
When shooting with <.> set and the camera and Speedlite’s PC 
terminals connected by a commercially-available sync cord, you can 
shoot without attaching the flash to the camera.
 
Even if you connect a different Speedlite to the Speedlite’s PC terminal 
with a sync cord, it will not fire.
 
If <s> is not displayed in step 1, set the flash Custom Function to 
C.Fn-05-3 (p.114).