Canon Speedlite 600EX-RT Instruction Manual - Page 108

Flash Firing Restriction due to Temperature Increase 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. Temperature Increase Warning When the internal temperature of the Speedlite increases, a warning icon is displayed in two levels. Display Icon LCD panel illumination Level 1 (Recycling Time: Approx. 8 sec.) e Red (turned on) Level 2 (Recycling Time: Approx. 20 sec.) f Red (blinking) Number of Continuous Flashes and Rest Time 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. Function Number of Continuous Flashes Until Warning Display (Level 1) (Guideline) Necessary Rest Time (Guideline) Continuous flash (p.13) Modeling flash (p.38) 48 times or more 10 min. or longer * 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) 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. 106