Need to trigger slave remote Canon Speedlite Flashes? There are some other advantages to using a flash as the master. Both the Canon Speedlite Transmitter ST-E2 and the flashes will allow flash output ratios to be adjusted between the channels they control. I expect that 2 channels are enough for most people. You might want to find out how many focus points each supports. EF lenses 28mm and up are supported, AI Servo mode is not supported.
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The major disadvantage of this optical wireless system is that you need a clear line-of-sight between the controller and the slave speedlite. Optical wireless works ok indoors in a studio where the signal can bounce off nearby walls and ceiling etc and has a range of around 15m.
Radio wireless is a far better option when possible. The ST-E2 has a very effective infra-red auto-focus assist beam that supports up to 45 focus points. It can also be used as a stand-alone focus aid in low light conditions even if you decide not to use the flash.
Remember that when using this controller you must have a clear line-of-sight between the controller and the speedlite for it to work. Manual Exposure The ST-E2 can be used to fire slave speedlites in manual mode, however, manual flash power cannot be set using the ST-E2 transmitter and has to be set directly on the slave speedlite. There is no dedicated manual control button, the slave speedlites must be switched to manual mode by hand.
Ratios can be set between to 1 and 1 to in half stop increments. Wireless Communication.
Canon ST-E2 Instruction Manual
Canon Speedlite Transmitter ST-E2 Review