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Amazon.com : Godox V1-C TTL Flash for Canon, 76Ws 2.4G 1/8000 HSS Rechargeable 2600mAh Li-ion Battery Round Head Camera Flash Speedlite, Godox XPro-C TTL Flash Trigger Compatible for Canon EOS Camera :
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Neewer NW670 TTL Flash for Canon Cameras with FC-16 10081788 B&H
TTL Flash Photography | Through The Lens Metering Explained | Tutorial