Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 42
Clearing Transmitter Settings, Test Flash from a Slave Unit
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Clearing Transmitter Settings/Test Flash from a Slave Unit 5 Take the picture. X Each slave unit fires in the flash mode that was set for each group. When the flash mode of the firing group is set to or , exposure is controlled to obtain a standard exposure for the main subject as a single group. If you shoot with multiple firing groups pointing toward the main subject, overexposure may result. The firing groups to be fired do not need to be consecutive; for example, A/ C/E can be set. Clearing Transmitter Settings You can return the settings for wireless shooting to their default settings. Press function buttons 2 and 3 simultaneously for 2 seconds or longer. X The transmitter settings are cleared and the shooting mode returns to flash mode. Even when the settings are cleared, the transmission channel, the wireless radio ID and the C.Fn and P.Fn settings (p.54) are not canceled. Test Flash from a Slave Unit You can fire a test flash from a flash set as a slave unit. For the operations, see the flash's instruction manual. When two or more units are set to master, the master unit with the lamp lit in green is the one that fires. 40