With video camcorders and DSLRs there’s a temptation to use the mic that is built in or mounted on the camera. On-camera mics can be useful for run-and-gun situations, or when the subject is very close to the camera. However, if you plan to shoot your movie mostly with an on-camera mic, be aware that there will be many situations where you’ll get bad sound. The camera is usually farther from the subject than is optimal for audio, and it’s often pointed at something other than the sound source. Also, built-in mics often pick up camera or handling noise. Avoid them when you can! Even if you’re filming alone, a wireless mic or sometimes a handheld mic can be a big improvement