If the relatively weak built-in flash of the 80D is strong enough for your shooting scenario, you don't need anything else at all. The Sunpak DF4000U has a built in optical receiver that can pick up the optical pulsed light communication of a Canon "Master" flash, such as a 580EX II or a 600EX RT, an ST-E2 optical pulsed light transmitter, or the built-in flash of your Canon EOS 80D. If you want to use the Sunpak DF4000U as an off-camera TTL flash with a Canon camera, you need either a wireless radio trigger set that is Canon E-TTL capable or a Canon E-TTL capable flash/optical controller that can act as a "Master" when attached to the camera's hot shoe.
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