Canon Speedlite EL-100 - Manual (Page 59)

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Troubleshooting Guide
Optical Transmission Wireless Flash Photography
Receivers do not fire, or mistakenly fire at full output.
● When using the flash as a sender, select [Wireless:Optical
transmission] on the camera (p.44). When using the flash as a
receiver, set the channel switch to the same channel as set on the
sender (p.44).
● Make sure the receiver unit is within the transmission range of the
sender unit (p.42).
● Point the wireless sensor of the receiver unit toward the sender unit
(p.42).
● Position the receiver unit at a location with the clearest possible view
of the sender unit.
● If the sender unit and receiver unit are too close, the transmission may
not take effect properly.
● When using the camera’s built-in flash as the sender unit, raise the
camera’s built-in flash, and set [Wireless func.] on the camera’s
[Built-in flash settings] screen.
The sender fires.
● The sender fires even when [Sender flash firing] is set to [Disable] ,
in order to control receivers optically (p.44).
Pictures are overexposed.
● When using autoflash with groups A, B, and C, do not aim flash units
in group C at the subject (p.52).