Canon Speedlite 600 EX-RT User Manual (en, zh)

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Just set the camera’s shooting mode to <X> (Shutter-priority AE), 
<W> (Aperture-priority AE), or <q> (Manual exposure) and you can 
use E-TTL II/E-TTL autoflash.
 
If you use the <Z> or <Y> shooting mode, the result will be the same as 
using the <V> (Program AE) mode.
 
1/X sec. is the camera’s maximum flash sync speed.
Using E-TTL II and E-TTL Autoflash in the Shooting Modes
X
Select this mode when you want to set the shutter speed manually.
The camera will then automatically set the aperture matching the shutter 
speed to obtain a standard exposure.
 
If the aperture display blinks, it means that the background exposure will 
be underexposed or overexposed. Adjust the shutter speed until the 
aperture display stops blinking.
W
Select this mode when you want to set the aperture manually.
The camera will then automatically set the shutter speed matching the 
aperture to obtain a standard exposure.
If the background is dark, such as in a night scene, a slow sync speed will 
be used to obtain a standard exposure of both the main subject and 
background. Standard exposure of the main subject is obtained with the 
flash, while a standard exposure of the background is obtained with a long 
exposure using a slow shutter speed.
 
Since a slow shutter speed will be used for low-light scenes, using a 
tripod is recommended.
 
If the shutter speed display blinks, it means that the background 
exposure will be underexposed or overexposed. Adjust the aperture until 
the shutter speed display stops blinking.
q
Select this mode if you want to set both the shutter speed and aperture 
manually.
Standard exposure of the main subject is obtained with the flash. The 
exposure of the background is obtained with the shutter speed and aperture 
combination you set.
Flash Sync Speeds and Apertures Used
Shutter Speed
Aperture
V
Set automatically (1/X sec. - 1/60 sec.)
Automatic
X
Set manually (1/X sec. - 30 sec.)
Automatic
W
Set automatically (1/X sec. - 30 sec.)
Manual
q
Set manually (1/X sec. - 30 sec., Bulb)
Manual
COP
Y