This paper deals with the design of a three spherical lenses corrector, able to produce wide flat field at the prime focus with focus ratio F/2.2 - 3.5m of a R-C telescope. The system is corrected over a spectral range extending from 300nm to 1100 nm. The corrector has the following characteristics: reduced size of the optics; all spherical surfaces; resolution better than 1 arcsec within 30 arcmin flat field ; possibility to extend the field up to 1 degree with reduced resolution. The image quality of the corrector is shown by means of Spot Diagrams, Point Spread Function and Encircled Energy Function for different off - axis values and spectral ranges. The paper also includes an analysis of possible alignment errors performed by means of computed interferograms.

Date Published: 26 September 1989
PDF: 9 pages
Proc. SPIE 1130, New Technologies for Astronomy, (26 September 1989); doi: 10.1117/12.961507

Published in SPIE Proceedings Vol. 1130:
New Technologies for Astronomy
Jean-Pierre Swings, Editor(s)