Yes, the DJI Mic Mini is compatible with the Sony Alpha A7R V.
Sony A7R V 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 A7R V includes a 3.5mm stereo mini-plug external microphone input per Sony published product specifications.”
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Confidence: inferred