Using a production slate is an inexpensive way to make your life easier when doing video work. It's a small step on set that lets you easily sync audio and multiple cameras. It also reduces the headache of whoever has to edit your video when you note "1.4 A, take 3 was the best shot" and that person can quickly scrub through footage and find the slate that reads "1.4A, take 3". http://photography.tutsplus.com/artic...