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Proceedings Paper

Final alignment of the VLT
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Paper Abstract

In a recent paper McLeod proposed and used measurements of the field dependence of third order astigmatism to collimate a Ritchey-Chretien telescope with the stop at the primary mirror. We adapt this method to the Cassegrain focus of the ESO Very Large Telescope, where the stop is at the secondary mirror and the telescope is only corrected for spherical aberration. In addition, we study the effects of the practical definition that the center of the field is the center of the adapter. We present measurements of the field astigmatism and discuss the accuracy of this collimation method.

Paper Details

Date Published: 20 July 2000
PDF: 9 pages
Proc. SPIE 4003, Optical Design, Materials, Fabrication, and Maintenance, (20 July 2000); doi: 10.1117/12.391501
Show Author Affiliations
Lothar Noethe, European Southern Observatory (Germany)
Stephane Guisard, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 4003:
Optical Design, Materials, Fabrication, and Maintenance
Philippe Dierickx, Editor(s)

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