We are planning to produce a Youtube channel, in which we interview one professor and one student at the same time, and we have very little experience with sound. A typical situation would be to have three people talking (the prof, the student, the interviewer), and we are wondering what would be a good compromise between budget and quality for recording the audio.
Lav mics seem to be the best option, but since we need three of them it seems expensive. Right? What about having a single shotgun carried by one of us over the scene? Could that work? I assume the person in question would be monitoring the sound to make sure that the mic is at the right position.
We are also planning to invest into a modest on-camera mic just for safety, in case something goes wrong with the other setup during the shootings. Any further advice?