An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 155
THE USE OF LENSES. position in viewing a picture so produced, these discrepancies disappear, and, indeed, are necessary to properly represent the object ; therefore this distortion is only an evil when it is so exaggerated that it is practically impossible to see the picture from the proper point,… … Fig. 48. When a single lens is employed in practical photo- graphy, it is necessary to use a diaphragm either in front or behind the lens to get the necessary definition over the required surface. But by the use of this diaphragm the edges of the picture are produced by the edges of the lens, the…
Photography
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