Physics – Optics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..381s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 381-385.
Physics
Optics
5
Atmospheric Correction, Cassegrain Optics, Lens Design, Optical Correction Procedure, Optical Equipment, Telescopes, Aberration, Counter Rotation, Gratings (Spectra), Prisms, Wave Dispersion
Scientific paper
A new type of field corrector, which can correct both aberrations and atmospheric dispersion, is proposed. There are two cemented lenses in such a corrector. Each cemented lens is made of two different kinds of glasses, of which the indexes of refraction are close and the dispersions are different. The cemented surface is tilted. The cemented lens is called a 'lensm' (lens-prism). The two lensms are not only the components for correcting aberrations but also form spectra of objects in the field of view. When the two 'lensms' are rotated relative to each other around the optical axis, the dispersion will be changed. By means of this, the atmospheric dispersion at different zenith distances can be compensated for. A practical example is given, and some other methods for correcting the atmospheric dispersion are also mentioned.
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