In this lesson on smartphone videography, the focus is on sound. The instructor emphasizes that sound is just as important as pictures and should not be overlooked. While the internal microphone on a smartphone is fine for atmosound or scratch sound, it will not capture crisp sound for a piece to camera or testimonial. The solution is to use an external microphone, such as a lav mic or directional microphone, which can be hardwired or connected via a radio link.

For more advanced smartphone videography, the instructor recommends using a rig to attach an external microphone. However, it's important to be cautious with directional microphones as they may pick up unwanted noise. The instructor stresses that good sound is crucial and can even make up for poor picture quality in post-production. On the other hand, bad sound cannot be fixed and can ruin an otherwise great video. Therefore, it's important to take sound seriously in smartphone videography.