. Carnegie Institution of Washington publication. PHOTOGRAPHY AND PHOTOMICROGRAPHY. obtained from Bausch & Lomb, who are under contract to manufacture them according to the Zeiss formulae. In buying a photographic outfit it is economy to get one of the high-priced lenses. It is frequently stated, by those who do not know, that "just as good results" can be obtained with cheap lenses, but one may easily satisfy himself that such is not the case by photographing buildings on a. Fig. I2I.« street or any object having many vertical parallel lines and other lines crossing at right ang


. Carnegie Institution of Washington publication. PHOTOGRAPHY AND PHOTOMICROGRAPHY. obtained from Bausch & Lomb, who are under contract to manufacture them according to the Zeiss formulae. In buying a photographic outfit it is economy to get one of the high-priced lenses. It is frequently stated, by those who do not know, that "just as good results" can be obtained with cheap lenses, but one may easily satisfy himself that such is not the case by photographing buildings on a. Fig. I2I.« street or any object having many vertical parallel lines and other lines crossing at right angles. The pictures made by the cheap lenses generally show serious distor- tions. In buying a lens one should know in advance exactly what he wishes to do with it, otherwise he may be greatly disappointed. If he wishes to photograph only *Fic. 121.—Viewer form of Zeiss-Abbe drawing camera. The camera is clamped at K by means of S. The prism within R is centered over the eye-piece by screw movements of L, and Z. When not in use the prism is swung to the right, as indicated by the dotted lines. The mirror A throws down the prismatic image to the drawing paper. The amount of light is governed by the substage iris-diaphragm and by rotating B and R, which contain smoky glasses of graded densities. P is an extra prism. The image on the paper will also be clearer if it is placed in shadow by means of a screen of some Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington


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