Canon Speedlite 600EX-RT - Manual (Page 99)

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C: Setting Custom Functions
C.Fn-06: + (Quickflash with continuous shot)
You can set whether or not to fire the flash in continuous shooting while the
flash-ready lamp is lit green (before the flash is fully charged).
0: OFF (Disabled)
1: ON (Enabled)
C.Fn-07: , (Test firing with autoflash)
You can change the flash output when firing the test flash in E-TTL II/
E-TTL/TTL autoflash mode.
0: 1/32 (1/32)
1: 1/1 (Full output)
C.Fn-08: - (AF-assist beam firing)
0: ON (Enabled)
1: OFF (Disabled)
The AF-assist beam is not fired from the Speedlite.
When Quick Flash is fired during continuous shooting, underexposure may
occur since the effective flash range becomes shorter. Setting 1 is
recommended only when you want to shorten the effective flash range
during short distance shooting.
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