Canon Speedlite 600EX-RT Mode D'emploi page 53

About Restrictions on Functions Depending on
the Camera Used
When performing radio transmission wireless flash shooting,
restrictions may apply to the flash mode, maximum flash sync speed
(referred to below as the "flash sync speed") and high-speed sync
function, depending on the camera that you use.
EOS digital cameras released since 2012
When using the flash with a camera such as the EOS-1D X, you can
shoot without any restrictions on the flash mode and flash sync speed.
* Although EOS REBEL T5/EOS 1200D was released since 2012, restrictions
on functions are the same as with EOS digital cameras released up to 2011.
(See the following explanation for details.) Radio transmission wireless flash
shooting using E-TTL autoflash can be performed with EOS REBEL T5/EOS
1200D.
EOS cameras compatible with E-TTL and released up to 2011
When using the flash with the cameras listed below, radio
transmission wireless shooting using E-TTL autoflash is not
possible. Shoot with manual flash (p.31), stroboscopic flash (p.33)
or optical wireless transmission (p.75).
EOS-1Ds, EOS-1D, EOS-1V, EOS-3, EOS ELAN II(E)/
EOS 50(E), EOS REBEL 2000/EOS 300, EOS REBEL G/
EOS 500N, EOS 66/EOS Rebel XS N/EOS 3000 N, EOS IX(E),
EOS IX Lite/EOS IX 7
Also, when using the flash with an EOS digital camera or EOS film
camera released up to 2011, the following restrictions apply.
1. The flash sync speed is 1 increment slower
Check the flash sync speed (X = 1/*** sec.) of your camera,
and shoot with a shutter speed up to a maximum of 1 stop
slower than the flash sync speed (Example: When X = 1/250
sec., radio transmission wireless shooting is possible from
1/125 sec. to 30 sec.). Also, high-speed sync shooting is
not possible. When you set the shutter speed 1 increment
slower than the flash sync speed, the <k> warning icon will
disappear.
2. Group flash is not possible (p.65).
' Radio Transmission Wireless Flash Shooting
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