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PICTURES 13 ^ to minor titles in the news column., which may very well be read if the attention be attracted to them. In sharp film they will be legible, but not as clear as in the news print analogy. The 80-mm. screen letters, appearing sharp or at least clear, as they do in good pictures, cor respond roughly to the column headings in the news paper. They must appear distinct if even the casual observer is to be satisfied. Anamorphosed or compressed negative motion pic ture images are obtainable in actual practice in which there is perfect definition of letters appearing even at the margin of the picture and of size down to 0.14 milli meter high on the film. Such letters to be sharp mean diffusion circles appreciably less than 0.04 millimeter on the film. In practice, letters that are 0.04 millimeter high on the film are illegible, the amount of illegibility fixing the diffusion circles in the central area at about 0.02 millimeter. It should be remembered that the projection lens works at twice the focal length of the typical camera lens we have been considering. The projection lens, how ever, when used on standard film, is required to cover at most a semiangular field of only 5 degrees, and under such conditions does fairly well. It is extremely poor at 10 degrees and useless beyond and, indeed, before 10 degrees. Where wide angle projection is necessary, it is pos sible to better the performance of the Petzval lens. Ref erence will not be made here to back screen projection where both the focal length and throw are short and the screen image less sharp than in standard practice. We have seen that attempts to improve lenses that perform similarly to the Petzval lens have resulted in the devel opment of the present motion picture camera lenses. In the case of the best motion picture lenses above de scribed, working at //2.3 or //2.7 for 4l/ 2 -inch focus,