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YONGNUO YN-622C-TX E-TTL Wireless Flash Controller for Canon
The distance is 100m with 7 channels and the Max Sync Speed reaches 18000S Can support TTL Ratio USB Firmware Upgrade AF Assist Beam Emitter It has 3Groups ABC and Sync mode 1st-curtain 2nd-curtain High-Speed SyncHSS Flash mode GRE-TTLII manual Super SyncE-TTLIIMulti flash Weight 82g and shutter release interface is 25MM Shutter release interface
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