Canon Speedlite 600EX II-RT Manual (en)

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Simply set the camera’s shooting mode to <s> (shutter-priority AE), 
<f> (aperture-priority AE), or <a> (manual exposure), and you can 
use E-TTL II/E-TTL autoflash suitable for each shooting mode.
 
If you use the <Z> or <Y> shooting mode, the result will be the same as 
using the <d> (Program AE) mode.
 
1/X sec. is the camera’s maximum flash sync speed.
E-TTL II/E-TTL Autoflash by Shooting Mode
s
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 the standard exposure based on the metering of the camera.
 
If the aperture value blinks, it means that the background exposure will 
be underexposed or overexposed. Adjust the shutter speed until the 
aperture value stops blinking.
f
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 the standard exposure based on the metering of the camera.
If the scene is dark, a slow sync speed will be used to obtain the standard 
exposure for both the main subject and background. The standard exposure for 
the main subject is obtained with the flash light, while the standard exposure for 
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 blinks, it means that the background exposure will 
be underexposed or overexposed. Adjust the aperture until the shutter 
speed stops blinking.
a
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 light. The 
exposure of the background is obtained with the shutter speed and 
aperture combination you set.
Flash Sync Speeds and Apertures by Shooting Mode
Shutter Speed
Aperture
d
Automatically set (1/X sec. to 1/60 sec.)
Automatically set
s
Manually set (1/X sec. to 30 sec.)
Automatically set
f
Automatically set (1/X sec. to 30 sec.)
Manually set
a
Manually set (1/X sec. to 30 sec., Bulb)
Manually set