Shooting with a second camera is a must if you want to save time on the set.
1) Action Scenes – you should always use several cameras during Action and stunt scenes.
2) Dialogue Scenes – you will need to work closely with the DOP, and the soundman, about when to use the second camera, what it is covering and what lens to use.
3) Filming kids and animals – this will help you get the shot on the first or second take as both children and animals will never do the same thing twice.
Peter D. Marshall