Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 38
Calculating the Shutter Speed
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q: Wireless Multiple Flash Shooting with Manual Flash Output 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 of the slave unit 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 slave unit's 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 and remote switch is recommended. Stroboscopic flash shooting is not possible with 1/1 power or 1/2 power flash. Stroboscopic flash shooting 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. 36