The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
000138
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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114 THE ADVANCE OF PHOTOGRAPHY the light not only undergoes refraction, but also dispersion— that is, since white light is composite and is built up of violet, indigo, blue, green, yellow, orange and red rays of differing wave lengths, these will not all come to a focus at one and the same point on the axis. In other words, they would spread themselves out into a spectrum along the axis, the violet end being nearer the lens, since light of that colour is the most highly refracted. The blue would thus cover the smallest area, the red the greatest, Crown Glass Flint Glass Fig. 36. hence an image on a screen would have a red border and general red tint if focussed for red. This is known as chromatic aberration. Now it is important in taking photos of coloured objects that they should all be in focus at the same time on the plane of the photographic plate, hence some steps must be taken to remedy this defect. This has been done by using a compound lens made up as shown in the accompanying diagram (36) ; the arrows show the direction of the incident light. A crown glass convergent lens is combined with a flint glass divergent lens ; thus one tends to annul the work of the