Directors of photography are responsible for the photographic heart of a production.
They read the screenplay and work closely with the director to discuss the look and feel of a film. They then research how to create the look through lighting, framing and camera movement and what they will need in terms of kit and crew to achieve this.
On each day of filming, DoPs and their camera crews arrive early to set up and rehearse. Working with the director, the DoPs do blocking (decide the exact movements of both actors and camera). They discuss any special camera moves or lighting requirements with the camera operator, gaffer and grip. Each shot is marked up for focus and framing by the focus puller and then the DoP oversees the lighting of the set for the first take.
It’s the job of DoPs to make sure every shot is usable and flag them when they’re not. They view the rushes (raw footage) with the director and work closely with the colourist in post-production. On smaller productions they shoot as well.