Johnson, George Lindsay, 1853- · London : G. Routledge · leaf 186
used for this purpose has to be plane and optically worked, or the definition of the image may be impaired. While it is quite true that the use of such glass plates introduces a slight elongation of the focal length, it is generally even safer to employ thick glasses than thin ones, for thin… … Fig. 22. — Sanger-Shepherd's Three-colour Plate Camera. ance. Unless a special camera is used, it is generally most convenient to fix it ou the hood of the lens. In
Color photography
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
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