I've just purchased the Flashpoint Streaklight 360 Ws for Canon (aka Godox AD360 II, which I can trigger with the R2 integrated wireless system (I trigger the flash with a transmitter that came with it).
It works perfectly, but the thing is that I also have a Canon Speedlite, the 580EX II, which I would like to use along with the Streaklight 360.
I figured I could just trigger it optically with the flash from the Streaklight, but it seems it won't respond to the flash. It works perfectly with the build-in popup flash on the camera.
So my question is, why won't the Canon Speedlite 580EX II trigger optically with the flash from the Streaklight? Am I missing something?