Canon Speedlite 600EX-RT Instruction Manual - Page 36
Calculating the Shutter Speed - external flash
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?: Stroboscopic Flash Calculating the Shutter Speed In stroboscopic flash, to ensure that the shutter stays open until the end of the continuous flashes, set the camera with a shutter speed calculated with the following equation. Number of flashes ÷ flash frequency = shutter speed For example, if the number of flashes is set to 10 (times) and flash frequency to 5 (Hz), set the shutter speed to 2 sec. or longer. To avoid degrading and damaging the flash head due to overheating, do not shoot repeatedly with stroboscopic flash more than 10 times. After shooting 10 times, allow a rest time of at least 15 min. If you shoot repeatedly more than 10 times, the safety function may activate and restrict the flash firing. If this happens, allow a rest time of at least 15 min. Stroboscopic flash is most effective when combining a highly reflective subject with a dark background. Using a tripod, remote switch and external power source is recommended. Stroboscopic flash is not possible with 1/1 power or 1/2 power flash. Stroboscopic flash is also possible when the camera's shooting mode is set to "buLb". When the number of flashes is displayed as "---", flashes are fired continuously until the shutter closes or the charge runs out. The maximum number of continuous flashes is shown in the table on the following page. 34