Accession Number : ADD009465

Title :   Lens System Having Wide Angle Objectives.

Descriptive Note : Patent,


Personal Author(s) : Baker,James G

Report Date : 25 May 1982

Pagination or Media Count : 8

Abstract : Wide angle optical objectives for use in aerial mapping cameras to provide improved resolving power and improved contrast rendition derived from the pattern of glass types and lens data employed. The outermost elements are weakly positive menisci to produce an initial convergence of rays before the mating negative elements are introduced thereby keeping the physical length of the system within modest proportions. Strong negative elements lying outside of centrally located strong positive elements provide favorable illumination over a wide angle field. Wafer elements near the center of the system serve to minimize chromatic astigmatism and to reduce the actual sagittal depth of the aspherics. Wafers of high index flint glass are located next to the central stop in order to obtain good chromatic spherical correction in the tangential rays over the field. (Author)

Descriptors :   *Patents, *Lenses, *Wide angles, Aerial cameras, Wide field cameras, Aerial photography, Astigmatism, Chromaticity, Glass, Tangents, Curved profiles, Contrast, Illumination, Inventions, Physical properties

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE