Yes, the DJI Mic Mini is compatible with the Sony FX3.
Sony FX3 has a 3.5mm stereo mini jack external microphone input. DJI Mic Mini includes a 3.5mm TRS analog camera output. Direct plug-and-play connection, no adapter required.
“DJI Mic Mini Camera Audio Cable (3.5mm TRS)”
“Sony FX3 includes a 3.5mm stereo mini-plug external microphone input per Sony published product specifications.”
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Confidence: inferred