Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4836..260h&link_type=abstract
Survey and Other Telescope Technologies and Discoveries. Edited by Tyson, J. Anthony; Wolff, Sidney. Proceedings of the SPIE,
Other
1
Scientific paper
The optical design for the WIYN One Degree Imager (ODI) is based on well-known princples for the design of secondary focus correctors of Ritchey-Chrétien telescopes. It started as the classical two element plus/minus pair of lenses required to correct moderate and wide fields of view whilst working with wide spectral regions. However, since this corrector is required to cover a one degree square and plane field of view, accommodate filters and an atmospheric dispersion compensator, it evolved into three elements. In order to avoid the addition of more glass than was absolutely necessary the third element was designed to serve the dual function of field flattener and dewar window. The final form presented here is plus/minus/minus in power distribution with well-separated elements. The ADC is situated between the first and second elements with filter between the second and third elements in an accessible position. Theoretically the worst-case image given is 90% of the ensquared energy into 2 by 2 pixels in the corner of the one degree square field.
Claver Charles Frederick
Harmer Charles F. W.
Jacoby George H.
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