Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133...37c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 1, April 1984, p. 37-48. Research supported by the European Southern
Astronomy and Astrophysics
Astrophysics
5
Error Correcting Devices, Instrument Errors, Lens Design, Optical Correction Procedure, Telescopes, Aberration, Algorithms, Asphericity, Astigmatism, Focusing, Optimization
Scientific paper
Prime focus correctors proposed for reflecting telescopes to cover a field of about 1 deg have been essentially of three types: three-lens systems with spherical surfaces and positive-negative-positive power distribution; similar systems with negative-positive-negative power distribution; and three-aspheric-plate systems. Of these, by far the most used has been the first type, based on pioneer work by Wynne (1965). However, all the solutions having a reasonably compact size suffer from higher order chromatic aberrations which oblige the supply of two correctors to cover the spectral range. Furthermore, practical experience with the triplet corrector of the ESO 3.6 m telescope has revealed problems of strain due to the thin, meniscus-shaped lenses. The possibilities, using aspherics combined with lenses, are analyzed, for improving the performance of correctors in both these respects.
Cao Chen
Wilson Raymond N.
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