Canon Speedlite 600 EX-RT User Manual

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C: Setting Custom Functions
C.Fn-12:
3
 (Flash recycle with external power)
0: 1 (External & internal power)
Charges in parallel using both internal power and external power.
1: 2 (External power only)
Internal power is needed to control the Speedlite. By using only external 
power for charging, you can minimize the depletion of the internal power.
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 Speedlite is fully charged, or 
when a slave unit is fully charged during radio wireless transmission flash 
shooting.
Note that when set to 1, a beep will sound as a warning when the flash 
firing restriction is activated due to a temperature increase in the flash 
head.
0: OFF (Disabled)
1: ON (Enabled)
COP
Y