I would just record on 1 a
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I would just record on 1 audio channel, then use your NLE editor to put the audio on both channels (maybe pan to one side or the other to match what’s happening on screen). Although your camcorder might have an option to route a mic input to both channels.
Unless you’re going to be in a sound stage all the time, I would recommend staying with a shotgun mic. They’re best for rejecting unwanted noises. I don’t think any stereo mics are shotguns.
BTW, I’ve been using the Rode VidoMic (the original shotgun version, NOT the stereo one), and it works well. Even though it’s monaural, it puts its signal on both left and right channels of the stereo miniplug.
Ken Hull