All-reflecting afocal telescopes

Details All-reflecting afocal telescopes All-reflecting afocal telescopes

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987spie..751..126w&link_type=abstract

IN: Reflective optics; Proceedings of the Meeting, Los Angeles, CA, Jan. 15, 16, 1987 (A88-34536 13-74). Bellingham, WA, Society

Physics

Optics

Cassegrain Optics, Mirrors, Reflecting Telescopes, Aberration, Beam Splitters

Scientific paper

Two-, three-, or four-confocal conic mirror sections are featured in the present family of afocal telescopes; of these, the first is the best known, but its performance is limited by field curvature. The three-mirror, Cassegrain/parabola or 'Offner' afocal telescope, can be corrected for field curvature and is suitable for high-magnification use. Attention is given to the least-known, four-mirror Cassegrain/Cassegrain configuration, which although the least known is noted to be the most effective as a unit power afocal relay.

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