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From http://pixsylated.com/blog/canon-speedlite-optical-wireless-fundamentals/ : With optical wireless, the master sends instructions to the slave(s) via a series of pre-flashes that come just before the main flash. These instructions tell the slave what mode to use (ETTL, Manual, or Multi), what power to fire at, and what sync speed to use. ...


From what I read here: http://scantips.com/lights/awl.html, the master flash uses IRlight to control the other flashes (just like a TV remote control), not visible light. (The red thing is the IR sensor) Anyway, light can transmit information just as any electromagnetic wave. Otherwise, you wouldn't be able to see the objects around you! There would be ...

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