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

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Troubleshooting Guide
 
Set the shutter speed 1 stop slower than the flash sync speed (p.51).
 
When an EOS camera which was released up to 2011, has an N3 type 
remote control terminal and is compatible with E-TTL II/E-TTL autoflash 
is used to perform remote release from a slave unit or when it has been 
set as the slave unit during linked shooting, the “Release Cable SR-N3” 
(sold separately) is necessary (p.68, 70, 104).
 
Linked Shooting
 
If you fire multiple flash units at the same time during linked shooting, 
the appropriate exposure may not be obtained or uneven exposure 
may result. It is recommended to set only one Speedlite to fire or to use 
self-timer to space out the timing of the flashes.
<k> is displayed.
Cannot release from a slave unit.
Uneven exposure occurs./The standard exposure is not obtained.
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