I believe the pieces we have
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I believe the pieces we have are about 3′ on a side. That’s plenty large enough, yet not cumbersome.
Here’s a suggestion with using audio separate from the camera: turn on the sound recorder, point the camera at yourself, and clap your hands together. This will give you a reference for synchronizing audio and video.
Mike and I disagree on one point. He suggests you run both mic inputs to the same receiver pack. The trouble with this is that in post you can’t adjust the level of one mic without effecting the other. Even though it appears to be a bit more work, I’ve found that having control over the input from each mic by placing them on separate channels makes for an easier edit in the long run. There’s no right or wrong here, just two different approaches.
Sounds like you’ll have a grand time experimenting with all of this.