Cinematography is the art of motion picture photography and filming. Cinematographers are in charge of the camera, whats in the shot, the positioning of the camera and makes what the director wants to happen happen and the cinematographer follows the directs lead.
The director of cinematography often speaks with the DoP to decide what kind of lens and focal length to use for filming, depth of filed and composition.
DIEGESIS
diegesis refers to the world of the film, there are three terms that explain the relationship between the audience and the camera – diegetic, intra- diegetic and extra- diegetic.
Diegetic perspective is how the audience is being asked to look at the content or subject on the screen
intra-diegetic when the audience are put into the place of a character and being asked to see things from their viewpoint E.G. Cloverfield
extra-diegetic is when someone on screen addresses the audience directly by looking directly into the camera, also known as “breaking the 4th wall” E.G. Deadpool