Physics – Optics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..444..118b&link_type=abstract
IN: Advanced technology optical telescopes II; Proceedings of the Meeting, London, England, September 5, 6, 1983 (A85-25230 10-8
Physics
Optics
Aberration, Field Of View, Focusing, Optical Correction Procedure, Paraboloid Mirrors, Telescopes, Cassegrain Optics, Lens Design
Scientific paper
Fast primary mirrors are often employed to reduce the length of the tube in new telescope designs, taking into account relative apertures in the region of f/2 or even f/1.5. Field correctors are needed, and for some applications a magnifying corrector giving a less convergent beam and larger scale is useful. One application for magnifying correctors is related to feed fiber optics for multiple-object spectroscopy. A study is conducted regarding the use of paraboloid primary mirrors, taking into account the compact secondary focus, thick corrector lenses, improved aberration correction, geometric transverse aberrations at the f/5 focus, and a 7.5 meter telescope with a two-meter diameter prime focus assembly. It is found that a compact f/5 focus can be produced from an f/2 primary mirror using a short Cassegrain system with a two-lens corrector, giving a flat field. If necessary, the lenses can be thick to embody optical devices such as dispersing prisms.
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