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Jan., 1930] WlDE FlLM STANDARDS 73
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which would have been obtained if the lens had been focused upon an object at infinity. It is quite logical to conclude that the lenses of longer focal length which will be used for the "Spectacular" and the "Extreme" dimensions will also answer the requirements of sufficient aberrationless covering power.
Although we are aware of the fact that opticians have been designing lenses for motion picture photography with a reasonable disregard of the aberrations outside of the image portion which is limited by the size of the motion picture camera frame, we also believe that the adoption of any one of the three proposed dimensions would involve no radical change in the present stage of development of motion picture photographic objectives.
The above brief exposition of the use of photographic objectives for film of a greater area than the one used as standard today is, of course, far from being a complete dissertation on the subject. We have merely introduced in this paper this phase of the new development with consideration to studio practice as a corollary to this survey of the wide film situation.
Projection Problems. — The average size of the screen in large auditoriums is 18 X 24 feet. This size involves, for the standard full aperture of the 35 mm. film, a 320 times linear magnification and approximately a 100,000 times magnification in area. The size of the screen image for this magnification and proposed dimensions would be*18 X 30 ft. for the "Economic," 22 X 36 ft. for the "Spectacular," and 27 X 45 ft. for the "Extreme."
We would mention here that the 320 times linear magnification has been increased approximately 10 per cent, without apparent loss of photographic quality, by a number of exhibitors who have reduced the height of the projector aperture in order to maintain the 3X4 screen dimensional ratio, and have magnified the 21 mm. width of the sound-on-film aperture to the 24 foot screen width.
We do believe that this magnification could be increased still further perhaps up to 400 times, after appropriate projection optical systems and the light source apparatus have been developed, without unduly impairing the appearance of the screen image for the optimum viewing point of the auditorium.
The increase of 25 per cent in magnification would bring the screen image to 22.5 X 37.5 ft. for the "Economic," 27.5 X 45 ft. for the "Spectacular," and 33.75 X 56.25 ft. for the "Extreme." We shall consider this magnification as reaching the extreme per