When Robin presented cinematography, aspects of the lens functions demonstrated how incredibly crucial these settings are. The movies shown in the lecture while Robin was talking about, gave the insight of the role of the iris and the knowledge of the focal length. Together, these created the dynamical impact of the depth of the frame from the film.
In terms of which lense lengths Robin used in the lecture, the scene of the lady drinking her champagne (she’s wearing a hat and a dark swimming suit, before the camera goes down wards and enters the pool) has a narrow lens angle than the other shoot as there appear to be a small depth of field here. This looks like a telephoto and when watching the film, 5 meters of lense length hit my mind first because the lady, as seen in Mollison’s article, she as the subject, moves her head and one of her arms both forward, backward and sideways across this range and she remains in focus.
If it has a deep depth of field or shallow, determinates on whether the aperture (the openness of the iris) is largely open or not. Considering the clarity of the subject contra the field, the iris was semi nearly closed and the clear lightning together with this, helped giving a deep depth of field.
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