Canon Speedlite Transmitter ST-E3-RT - Manual (Page 59)

57
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 <9>,
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)
COP
Y