Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 59
C.Fn-07, Test firing with autoflash, C.Fn-13, Flash exposure metering setting, C.Fn-20, C.Fn-22, LCD
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C: Setting Custom Functions C.Fn-07: , (Test firing with autoflash) You can change the flash output when firing the test flash in E-TTL II/E-TTL autoflash mode. 0: 1/32 (1/32) 1: 1/1 (Full output) C.Fn-13: 6 (Flash exposure metering setting) 0: 4 (Speedlite button and dial) 1: 5 (Speedlite dial only) You can perform flash exposure compensation by directly turning , without pressing the button. C.Fn-20: 7 (Beep) You can enable a beep to sound when the slave units are fully charged. 0: OFF (Disabled) 1: ON (Enabled) C.Fn-22: < (LCD panel illumination) When a button or dial is operated, the LCD panel illuminates. You can change this illumination setting. 0: 12sec (On for 12 sec.) 1: OFF (Disable panel illumination) 2: ON (Illumination always on) 57