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

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tc(mm ) 26.1 D^rhos) 60 50 N values > 1 not permitted Region of divergence (M=218) 15 No 10 •< Zc (in mils) *• Fig. 14. Graphical analysis of "Verivision" technique (<p fixed at 0.3°, tc adjusted so that optical axes intersect at A) Converging characteristics, shown at 10p intervals to 70p, show very limited depth range possibilities of the system, since only unshaded central area can be employed, and only that part of it bounded by available limiting values of tc. Note that B = 0 only when point of intersection of characteristic curves occurs at N0. This corresponds to zc — 20.5 mils, or M = 122. phasizes the extra dimension by placing some meaningless post or tree or lampstand in the foreground of each shot, the audience will become as weary of these tricks as they became of the endless knives, ladders and hurtling baseballs of the prewar anaglyphic pictures. The left or right-eye track of a 35-mm double-band stereo film may without modification be presented to a wider audience in unconverted theaters as a normal flat film. However, the more successfully the film's director has thought himself into the new world of the 3-D film, with its different space relations, rhythms of cutting, and use of optical effects, the less effective will be the flat version by comparison with what the same director would have made out of the same story had he concentrated on it alone. The translation of the director's ideas into 3-D film demands a comprehensive knowledge of stereoscopic transmission theory — in just the same way as an electronic organ designer could not inter Spottiswoode, Spottiswoode and Smith: 3-D Photography 283