Cinematographic annual : 1931 (1931)

Record Details:

Title:
Cinematographic annual : 1931
Date:
1931
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1931
Leaf #:
00059
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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CHROMATIC CORRECTION IN CINEMATOGRAPHIC LENSES A. Warmisham* RECENT years have been marked by a general adoption of panchromatic films in the studios and the corresponding reaction on lens design and correction. Opticians never cease in their efforts to improve chromatic correction and also the correction of the spherical aberration which is inseparable from it. The means for precision measurement of chromatic aberrations will first be described. Figure 1 shows an optical bench specially adapted for color testing, and Figure 2 shows schematically how it works. The group on the right comprises a monochromator; light is con Fig. 1 . Optical bench for color testing densed on the first slit A, whence it is picked up by a collimating objective B, passed through a dispersing prism C, and focused by another objective D, in the plane of a second slit E, as a continuous spectrum. Any desired wave length could be projected through the second slit by rotation of the dispersing prism, but in this particular apparatus the dispersing prism is immovable and the different colors are projected through the second slit by means of a set of auxiliary prisms which displace the spectrum to the desired amount. These auxiliary prisms are conveniently mounted in a turret which is operated from the observer's end of the instrument so that one can •Optical Director, Taylor Hobson Company. England. [27]