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THE CINEMA AS A GRAPHIC ART
distance 01 ioo feet from the set-up. The shot is taken with a lens of focal lengt 35 mm. This lens will have an effective angle of vision of 380, calculated alon the frame horizontals.
Marking out the extreme limits of the effective angle of vision so that froi the chosen set-up they completely embrace the natural section of the set, we g» the dimension of our models for any point along the line of the lens' main optic axis.
The closer the model is brought to the set-up, the smaller will be its line; dimensions. On the millimetre-squared paper we can calculate the linear dimer sions of the model to within three or four inches. Thus we get the necessai dimensions — the breadth of the model and its distance from the set-up.
We make a similar calculation for a profile-plan of the entire constructio! In this case the effective angle of vision, reckoned for the verticals of the fram» will be equal to 290. From this calculation we get the linear dimensions of tr. height of the model. After informing the art director of these dimensions tr camera-man has only to mark out on his chart the point at which the model h< to be set up in front of the camera. With such preliminary calculation the corr bination is achieved very simply, and the height at which the model is to b suspended on its supports can also be determined beforehand.
Among special calculations we must also include the determination of th size of representation of the object in the shot, which is required in many forrr of short-timed exposure of the shot. It is necessary to introduce this calculation based on well-known formulae, into the camera-man's scenario treatment.
The foregoing comprise certain general considerations concerning the metho of planning the camera-man's scenario treatment. Experience of recent yeai has shown that the existence of a special camera-man's scenario, worked 01 parallel with the director's and in contradistinction from his, is not desirable Undoubtedly it is a sound principle to have only a single production scenarit which should also be the general project for the film being made, and usable b everyone. The camera-man can make his separate notes.
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