Canon Speedlite 600EX-RT - Manual (Page 108)

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When continuous flash, stroboscopic flash or modeling flash is repeatedly fired
in short intervals, the temperature of the flash head may increase. When
repeated firings of the flash exceed the values shown in the table below, the
flash firing restriction activates automatically to avoid degrading and damaging
the flash head due to overheating. While flash firing is restricted, a warning icon
is displayed to indicate the increase in temperature, and the recycling time is
automatically set to an interval between approx. 8 and 20 sec.
When the internal temperature of the Speedlite increases, a warning
icon is displayed in two levels.
The following table shows the number of continuous flashes until the warning is
displayed, and the necessary rest time until normal flash shooting can be performed.
* At full flash output with flash coverage of 14 mm/20 mm
* With external power source, the number of flashes will be two thirds (32 times or more)
Flash Firing Restriction due to Temperature Increase
Temperature Increase Warning
Display
Level 1
(Recycling Time:
Approx. 8 sec.)
Level 2
(Recycling Time:
Approx. 20 sec.)
Icon
e f
LCD panel illumination Red (turned on) Red (blinking)
Number of Continuous Flashes and Rest Time
Function
Number of Continuous
Flashes Until Warning
Display (Level 1)
(Guideline)
Necessary Rest Time
(Guideline)
Continuous flash (p.13)
48 times or more 10 min. or longer
Modeling flash (p.38)
The number of continuous flashes until warning display during
stroboscopic flash varies depending on the flash output.
For the recommended number of flash firings, see the sections on continuous
flashes (p.13), stroboscopic flashes (p.33) and modeling flashes (p.38).
If you change the batteries after firing many flashes continuously, be
aware that the batteries might be hot.
When C.Fn-20 is set to 0 (p.99), the warning beep does not sound even
when flash firing is restricted.
COP
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