F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000130
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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112 RICHARDSON'S BLUEBOOK OF PROJECTION of lens to film) is very short, while the other (optic center of lens to screen) is very long; therefore a very slight alteration of the shorter conjugate foci point will have a large effect upon the longer one, or vice versa. Lens Correction (48) All uncorrected lenses have spherical and chromatic aberration, as well as other faults. The aberrations may be eliminated by various combinations of glass and curvatures. Focal Length (49) The focal length of a simple lens is the distance from its optical center to the center of the image it Figure 35 forms when the image is in sharpest possible focus and the object being focused is sufficiently distant so that light rays enter the lens in essentially parallel lines. (50) The focal length of a lens is somewhat affected by the refractive index of its glass, but chiefly by the curvature of its surfaces. This is illustrated in Fig. 35, wherein we see two simple lenses in which the fault of spherical aberration has been disregarded. The actual performance of such lenses is shown in Fig. 36. It does not alter the focal length of the lens in any degree.