Large Telescope Designs With A Spherical Primary Mirror

David R. Shafer

doi:10.1117/12.957062

3 May 1979 Large Telescope Designs With A Spherical Primary Mirror

David R. Shafer

Proceedings Volume 0172, Instrumentation in Astronomy III; (1979) https://doi.org/10.1117/12.957062
Event: Instrumentation in Astronomy, 1979, Tucson, United States

Abstract

Very large telescopes of the future will be much more practical to build if the large primary mirror can have a spherical surface. This greatly reduces the time and expense required to optically figure a large surface. Several two-mirror designs are discussed which have a spherical primary mirror and a sub-aperture diameter aspheric secondary mirror. The light path reflects off of both mirrors twice, and the system is corrected for spherical aberration, coma, and astigmatism. Designs with small obscuration are possible if astigmatism correction is dropped. Scanning arrangements for huge Arecibo-type systems are also discussed.

Citation Download Citation

David R. Shafer "Large Telescope Designs With A Spherical Primary Mirror", Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); https://doi.org/10.1117/12.957062

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