Amazon.com : YONGNUO Updated YN600EX-RT II Wireless Flash Speedlite with Optical Master and TTL HSS for Canon AS Canon 600EX-RT w/EACHSHOT Diffuser : Electronics
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video clip: using the Canon 600EX-RT Speedlites on a photo shoot - Tangents
Radio Controlled Speedlites: Yongnuo YN600EX-RT vs Canon 600EX-RT | Blog.JimDoty.com
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Jeff Cable's Blog: The Canon 600EX-RT Flash System - A real-world test