3. Director of Photography
The Director of Photography (Cinematographer or DoP) is the head of the camera and lightening department. The responsibilities of a DP will vary from set to set but they are always the one who achieves the 'look' of a shot. In charge of the positioning of the lighting, lenses and filters, the DoP's stamp is always firmly one what we see in a movie. However, how much influence they have over things like framing and shot choice is up to the director. The two will often work very close with each other and come to joint decisions over how a shot should look but the level of influence is generally down to how free a director is and how much technical knowledge they have. Sometimes a DoP will be responsible for the framing, lighting and lens choice after a director has conveyed the vision and what they want a shot to look like. However, sometimes a director will convey exactly where a camera should go, what lens should be used and what the lighting will be and it is the DoP's job to make it happen and give suggestions. However, you will find that a lot of DoP's have a fairly big say in how a film will look and have their own visual stamp of the film. For example, Skyfall was very clearly a Roger Deakin's film just from how it looked. In fact, if you have any interest in becoming a DoP, look up and read up on Deakin's previous work. There are few other cinematographers who are as 'important' as him.