F. H. Richardson's bluebook of projection (1942)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000205
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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LENSES AND MIRRORS 189 of lens to film) is very short, while the distance to the other (optic center of lens to screen) is very long; t! fore a very slight alteration of the shorter conjugate foci point will have large effect upon the longer one. Lens Correction (48) All uncorrected lenses have spherical and chic matic aberration, as well as other faults. The aberra tions may be eliminated by various combinations of g 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 FlGl w forms when the image is in sharpest possible focus and the object being focused is sufficiently distant so thai light rays enter the lens in essentially parallel lines. (50) The focal length of a lens is somewhat affected bv the refractive index of its glass, but chiefly by the curvature of its surfaces. This is illustrated in 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 81 l\ not alter the focal length of the lens in any decree.