The external flash unit can also use the slave mode and in this case are piloted by a flash from a master or using special infrared. The problem in these cases is the low power of infrared rays that force them to work with the unit clearly visible in a straight line, without considering the lack of distance possible. Making shots, then, with wide-angle lenses becomes very complicated.
The radiopopper serve to remedy such issues, because they are able to exploit the system ETTL and radio waves allowing flash hide behind people, rocks or very distant from you. The signal is read by radiopopper, translated into radio waves received from other radiopopper which in turn ritrasformeranno in the infrared flash drives for the local cable through a small place before the IR sensor.
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