Optical quality of the Calar Alto 3.5 M telescope

Details Optical quality of the Calar Alto 3.5 M telescope Optical quality of the Calar Alto 3.5 M telescope

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..543h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 543-548.

Astronomy and Astrophysics

Astrophysics

2

Optical Properties, Reflecting Telescopes, Aberration, Wave Fronts

Scientific paper

The optical quality of the Calar Alto 3.5-m telescope with an improved Hartmann tester allowing for Hartmann tests as well as Foucault tests was examined. The radius containing 50 percent of the geometrical energy concentration was found to be 0.26 arcsec for the Ritchey-Chretien focus and 0.31 arcsec for the prime focus. Decentering coma is the main contribution to the optical aberration. The Seidel aberrations and the light concentration do not depend on the zenith distance. The actual focal lengths of the 3.5-m telescope differ by less than 0.08 percent from the specified values.

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