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

Record Details:

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Jan., 1930] PROBLEMS OF WIDE FILM PICTURES 53 let us say, two inches in the vertical plane and one inch in the horizontal. The result would be that all vertical lines would be brought closer together and more space could be covered in the horizontal plane while the height of the figures would be normal for a 2 in. lens. The image on the film would be a very unusual looking image but projected through a projection lens with a similar added cylindrical system it will be restored to normal proportions and theoretically the projected picture would give no indication that it has been subjected to such unusual treatment. If an optical system of this type could be designed to work satisfactorily in respect to speed and image quality, a task bristling with difficulties, it would overcome the difficulty mentioned earlier of poor sound reproduction and it would probably be somewhat easier FIG. 2. Illustrating the meaning of the expression "angular field of view." AO// equals tangent of onehalf of angular field of view. from the illumination standpoint. From the standpoint of image quality, however, even neglecting the effect of aberrations in the added system itself it is not obvious that we would obtain results of any better quality than we would secure by photographing with an ordinary photographic lens of correspondingly short focus and projecting with correspondingly higher magnification. We would, to be sure, have the great reduction in photography and the extraordinary magnification in projection in the horizontal plane only instead of in all directions but it does not seem likely that this would reduce in any appreciable degree the difficulties due to grain and limited resolving power of the film. The successful application of the methods previously outlined imposes problems on both the lens designer and on the emulsion