Faster strobe: Canon Speedlite 600EX II-RT by Jose Antunes - ProVideo Coalition
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Amazon.com : YONGNUO Updated YN600EX-RT II Wireless Flash Speedlite, GN60 with Optical Master and TTL HSS for Canon 600EX-RT, ST-E3-RT Wireless Signal Camera : Electronics
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Canon Speedlite 600EX-RT Flash , Pouch, Bracket, Pro Kit 5296B002