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How Canon DSLRs Communicate with Speedlites Using Light

4 monthes ago   |   By Peta Pixel

Canon DSLRs can trigger Canon Speedlites using the pop-up flash. If you try triggering those same Speedlites with a different camera's flash, it doesn't work, which means that there's actual light-based communication going on between the DSLR and Speedlite. In this 9-minute video, Roger Nieh of Science'n'me explores the technology behind this communication.
“Have you ever wondered how Canon rebel cameras wirelessly trigger speedlights with just its flash?” Nieh writes. “In this video, the pre-flash signal is analysed, decoded, and finally emulated using a microcontroller.”
Since DSLR...
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