Canon Speedlite Transmitter ST-E3-RT Instruction Manual

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:

(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:

(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)

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