Canon Speedlite 600EX-RT Instruction Manual - Page 75

Linked Shooting with Radio Transmission Shooting with manual focus is recommended for the slave unit cameras. If focus cannot be achieved with autofocus, linked shooting is not possible with the corresponding slave unit camera. There is a short time lag between the release of the slave unit camera and the release timing of the master unit camera. Perfectly simultaneous shooting is not possible. 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. When [Flash firing] in [Flash function settings] is set to [Disabled] (p.44), linked shooting cannot be performed. When performing linked shooting in the Live View state with P.Fn-07 set to 0 (p.102), set [Silent LV shoot.] on the master camera menu to [Disabled]. If [Mode 1] or [Mode 2] is set, the slave unit cameras will not be released. The transmission distance may be shorter depending on the conditions such as the positioning of slave units, the surrounding environment and weather conditions. The linked shooting function is the same function as the linked shooting featured by the WFT series of wireless file transmitters. However, linked shooting cannot be performed in combination with the WFT series. Moreover, the release time lag differs from linked shooting performed using the WFT series. You can use this function as a master unit remote control for linked shooting without attaching a Speedlite or transmitter to a camera. When function button 1 on the master unit is pressed, all the slave unit cameras are released. During linked shooting, the time until auto power off takes effect is 5 min. for both the master and the slave cameras. During linked shooting, the Speedlites can be fired (P.Fn-07/p.102). 73