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the flash will work wirelessley in one of two ways:
either using the optical sensor on the front of the flashgun - in order to use this, you need to have your popup flash fire. The flashgun will detect your popup flash going off and instantly trigger. To do this, you need to power on the flash, then hold down the mode button so the light starts blinking.
The other way (without needing your popup flash) is to get a wirekess trigger and receiver.
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