Canon Wireless File Transmitter WFT-E8A Manuel

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Positioning the Cameras
If focus cannot be achieved with autofocus, linked shooting is not 
possible with the corresponding slave camera units.
Do not use multiple flash units. Although slight, there is a difference in 
the shutter release timing which may cause out-of-sync flash firing and 
inadequate exposure.
Linked shooting is not possible when the slave cameras are set to any 
setting other than [Mirror lockup: Disable], or when the Live View 
shooting/Movie shooting switch of the master or slave camera is set to 
<k>.
During linked shooting, when you press the AE lock or depth-of-field 
preview button, the camera adjusts the focus and meters as if you had 
pressed the shutter button halfway.
Once you have established a connection between the master camera 
and slave cameras, the settings are retained even after you replace the 
batteries.
If you will no longer use a slave camera in linked shooting, set 
[Connection settings] to [Disconnect] on that slave camera.
Any cameras compatible with linked shooting, when they have WFT 
series transmitters attached, can be used as slave cameras, regardless 
of model.