Canon Speedlite 600EX-RT Instruction Manual - Page 101
C.Fn-12, Flash recycle with external power, C.Fn-13, Flash exposure metering setting, C.Fn-20
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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 , 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) 99