Yongnuo ST-E2�is a�very similar�to the Canon ST-E2 wireless flash controller�that was released way back in 2004-05 era when the Canon 550EX and film EOS cameras were still the bread-and-butter products of Canon.�Yongnuo�improved features of the Canon�s model and added some new functions.Unlike radio triggers, the ST-E2 requires line-of-sight for the flashes to receive the signal of the controller. However, line-of-sight is less critical when in an indoor environment as nearby walls and ceilings aid the IR beam patterns even without line-of-sight.
Yongnuo ST-E2�is a�very similar�to the Canon ST-E2 wireless flash controller�that was released way back in 2004-05 era when the Canon 550EX and film EOS cameras were still the bread-and-butter products of Canon.�Yongnuo�improved features of the Canon�s model and added some new functions.Unlike radio triggers, the ST-E2 requires line-of-sight for the flashes to receive the signal of the controller. However, line-of-sight is less critical when in an indoor environment as nearby walls and ceilings aid the IR beam patterns even without line-of-sight.
