Computer Science – Performance
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980s%26t....60...64s&link_type=abstract
Sky and Telescope, vol. 60, July 1980, p. 64-70.
Computer Science
Performance
Astronomical Photography, Lens Design, Optical Equipment, Telescopes, Aberration, Astigmatism, Coma, Design Analysis, Mirrors
Scientific paper
Eight 8-inch f/5.6 photographic telescope designs are compared, with emphasis on extra-axial image quality. Specifications are presented including coma, astigmatism, and chromatic aberration for five standard configurations, Newtonian, Ritchey-Chretien, Schmidt-Cassegrain, Maksutov-Cassegrain, and refractor, along with three other designs. The advantages of these three for extended-field photography of the stars are discussed. The concentric Schmidt-Cassegrain has primary and secondary mirrors with a common center of curvature at the corrector plate, providing resolution better than all commercial and astronomical emulsions, but has great tube length. The Simak telescope is compact and achieves greatly improved performance over the Gregory-Maksutov design of 1957 by freeing the secondary mirror from the corrector, and the Hexagon is an all-lens system with high resolution in a much wider field than 3 deg; freedom from chromatic aberration is obtained by using calcium fluoride for one of the elements.
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