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Canon Support for EOS 77D | Canon U.S.A., Inc.
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Canon EOS 77D Speedlite Flash (e-TTL, e-TTL II) Vertical & Horizontal Rotation (Wireless Sync Built In) - Walmart.com
Trigger Canon EOS 77D Off Camera Flash | Tutorial - YouTube
Digital Speedlite Flash For Canon EOS Rebel T8i 90D T7i T7 T8 77D SL2 | eBay