![]() ![]() This means you can rotate the lower body of the flash so that it points at your camera but still rotate the head so that it points at your subject.Īhh.I think I understand now. Keep in mind the 430EX II, 580EX II, and 600EX-RT all have a flash head which can tilt AND rotate left-right. If the remote light doesn't fire when the on-camera flash fires then the lower unit may not have a good light of sight. The front of the lower body has a red-tinted panel which resemlbes what you'd see on an IR remote control - leading people to presume that it's IR. But receiver in the slave flashes is on the lower body (not up in the flash head). The built-in flash uses pulses of light (visible light) to communicate with the slaves and send instructions. The 600EX-RT can also be a master or a slave (and can do optical or radio but radio requires a radio trigger - Canon sells a dedicated ST-E3-RT radio trigger or another 600EX-RT flash can be used as a master/trigger. The 430EX II can be a "slave" (remotely triggered flash) but cannot be a master. This is an optical trigger and requires line-of-sight to the off-camera flash. The native (built-in) flash IS the trigger.
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