Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 64
The slave flash does not fire or unexpectedly fires at full output., The picture is underexposed or
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Troubleshooting Guide The slave flash does not fire or unexpectedly fires at full output. Run the channel scan and set the channel with the best radio reception signal (p.22). Position the slave unit in clear view of the master unit, without obstacles between them. Face the slave unit's front toward the master unit. The picture is underexposed or overexposed. If there was a highly reflective object (glass window, etc.) in the picture, use FE lock (p.30). If the subject looks very dark or very bright, set flash exposure compensation (p.27). When high-speed sync is set, the effective flash range is shorter. Position the slave unit closer to the subject (p.29). When using autoflash shooting with three firing groups A, B and C, do not fire with firing group C pointed toward the main subject (p.33). When shooting with a different flash mode setting for each firing group, do not fire with multiple firing groups set to or pointed toward the main subject (p.40). The picture is very blurred. When the shooting mode is set to and the scene is dark, slow sync is enabled automatically (the shutter speed becomes slower). Use a tripod, or set the shooting mode to or fully automatic mode. Note that you can also set the sync speed in [Flash sync. speed in Av mode] (p.49). 62