Journal of the Society of Motion Picture Engineers (1930-1949)

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Fig. 7. Slate 15 of The Black Swan. Camera out of picture on left, banners raised successively in pairs to reveal Beryl Grey in background. cover the musical transition and hide the break which was intended for stage applause. Computing the Stereo Settings The simple mechanics of this shot are shown in Fig. 7. But how is the stereotechnician on the set to ensure that the director's wishes as to the placing of the scene in space in the ultimate movie theater are precisely carried out? First it is necessary to decide the size of screen for which the film is to be shot, since this will determine Af, the one element in the C factor which is not controllable when shooting. If the anticipated variation of screen width is not very great, it is best to set M for the largest screen size, and accept some loss of depth on smaller screens. But if a wide range of screen sizes must be provided for, it is better to find a mean magnification so that the loss on the smallest screen is not too great, while accepting some divergence on infinity points on the large screens unless these are corrected in an optical printing Spottiswoode, Spottiswoode and Smith: 3-D Photography 267