A study of the role of focal length in image generation
Loading...
Date
1967-06
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University. Division of Geodetic Science
Abstract
This is a final report on research to study the role of focal length on the quality of the photogrammetric image. The evaluation is based on established quality criteria which are affected by many elements. This ingressive study is presented. in three sections: I. In terms of Acutance and Resolving Power. Two lenses were studied using Micro image density difference curves along selected objective images. Studies indicate shorter focal length corresponds to somewhat better acutance and resolution. II. In terms of Modulation Transfer Function (MTF). Two lenses were studied under various aperture settings and light conditions. Studies indicate that, generally, shorter focal lengths give higher MTF. III. In terms of Chromatic and Spherical Aberrations, Radial Distortion, Curvature of field and Astigmatism. Three lenses were studied by various methods using changed apertures. Studies indicate, generally, the aberrations and radial distortions are functions of focal length. There is no apparent correlation between focal length and astigmatism, or curvature of field. Other interesting observations are noted and recommendations are made.
Description
[Prepared for] U.S. Army Engineer, Geodesy, Intelligence and Mapping Research and Development Agency, Fort Belvoir, Virginia: Contract No. DA-44-009-AMC-894(X), Department of the Army Project No. 4A014501A52C, OSURF Project No. 1959