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126 THREE-DIMENSIONAL MOTION PICTURES mating this large marginal color error, namely by only partially achromatizing each of the two members of the anainorphoser. Despite the existence of only a partial achromatiza- tion along the axis of each of the two members, the ob jective as a whole yet has a very satisfactory paraxial nd spherical color correction, one part in seven hundred and one in a thousand, respectively. The resulting dif fusion circles for an associated 50-mm. camera lens are less than 0.002 millimeter in a diameter, a value that, as will be seen, is too small to produce any deteriorating effect on the quality of a motion picture image. Since the anamorphoser is afocal, its relative open ings depends only on its absolute size. It is, in fact, con venient to choose the size so as to reduce the aberrations considerably below those of the spherical objective with which the anainorphoser is associated. The anamor phoser has, therefor, an almost negligible deteriorating effect upon the image. In fact, the very slight effect ob served must be attributed almost entirely to the inter position of the four air-to-glass refracting surfaces. It amounts at the most, to a difference of one stop; and since motion picture lenses are now available that are appreciably more than this amount superior to most motion picture lenses now in common use, it will be obvious that one can obtain all the advantages of the anamorphoser for the production of wide screen pic tures and yet retain the quality of picture to which the critical observer is now accustomed. Except for the slight effect of surface loss, the ana morphoser does not increase the required exposure time. On projection, there is a light loss due to the expansion, and which is proportional to the expansion. We have experimented until we can print anamorphosed film so that the projected image appears as brilliant as ordinary screen images. Before this result was accomplished, it