An introduction to the science & practice of photography (1888)
Jones, Chapman · London : Iliffe & Son · leaf 148
144 THE SCIENCE AND PRACTICE OF PHOTOGRAPHY. ever, by these who use glass screens in connection with the lens as in orthochromatic photography. 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… … Fig. 43. required surface. But by the use of this diaphragm the edges of the picture are produced by the edges of the lens, the centre of the picture by the centre of the lens, and so on. We have already seen that the refracting power of a lens for rays parallel to its principal axis is nothing at…
Photography
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