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PROBLEMS OF WIDE FILM PICTURES 51
tinctly not entertaining after the novelty has worn off. Further, the producers are ambitious to attempt to record the stage settings as well as the music of opera and musical comedies.
To meet the situation it is necessary to project a picture in which the figures remain of a sufficiently large size but which includes more of them. This means, obviously, a wider included angular field of view and a larger projected picture.
To accomplish this, two methods of attack occur at once. One
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method would consist in moving the camera farther from the set or in using lenses of shorter focal length thereby reducing the size of the images of the individual components of the set and permitting more of them to be included. Now, if this picture is projected through a projection lens of sufficient power to restore the figures to the customary size on the screen, a much larger total picture size will result. It will be larger in height as well as in width. Since we are only infrequently interested in any great amount of space above the heads of the human figures in the set we would be embarrassed with this superfluous space, in general. It would be possible, however, to reduce the frame height, let us say, to the point where its relation to the height of the human figures was restored to something like what we have been accustomed to. Now this all sounds very good. Several more frames, possibly twice as many, could be recorded on a foot of film; film consumption would be decreased and film magazines reduced in size or else hold a much longer record.
This procedure, however, is impractical, first because the resolving power of photographic emulsions of adequate speed is insufficient to permit a satisfactory screen image to be obtained by such a process. Graininess would be very pronounced and detail would be lost. It would, furthermore, be impractical in the present state of development of the optical systems employed in the sound-on-film processes since it would be impossible to get a satisfactory reproduction of sound because of the loss of high frequencies. Finally, it is not at all sure that such a picture could be projected with anything like a satisfactory degree of brightness.
A modification of this solution was demonstrated at the meeting of the Optical Society of America at its meeting in Washington in November, 1928, which is interesting enough to justify examination. You have probably all observed that if you hold a telescope of any kind before your eye in a reversed position all objects seen through it are apparently reduced in size and look more remote. If you hold