A good DP, as I have recently experienced, knows that they are a Director themselves. The camera/lighting/grip department all seems to work together with one force under them, while the Actors/Script/Wardrobe/Sound works with the main Director.On my very first feature film as both a director/cameraman, I had so much to do as a director that I didn't realize that my camera had actually run out of film...I shot a whole scene without film. No kidding. Had I hired a cameraman, he would have caught that stupid mistake. I was too busy to notice. True story.