Photographic optics and colour photography [electronic resource] : including the camera, kinematograph, optical lantern, and the theory and practice of image formation (1909)
Johnson, G. Lindsay (George Lindsay), 1853-, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Ward & Co. · leaf 228
the focus backwards will always = t whenever the plate may be situated between the lens and the screen. As the object is made to approach the lens the displacement diminishes in the same ratio until, at 2F, the maximum shifting is reduced to one-half or t1^^-- Since the colour screen which… … Fig. 156. Fig. 157. may be neglected, except in copying objects in one plane, such as pictures and maps, and in portraits and groups. If the glass is not worked, i.e. if the surfaces are not true planes, it will refract unequally, and aberrations of all kinds will be set up, which will more or less…
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