Sloan digital sky survey 2.5-m telescope: light baffles

Details Sloan digital sky survey 2.5-m telescope: light baffles Sloan digital sky survey 2.5-m telescope: light baffles

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3352..653s&link_type=abstract

Proc. SPIE Vol. 3352, p. 653-664, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.

Physics

3

Scientific paper

The Sloan Digital Sky Survey 2.5-m telescope is unique with a 3 degree(s) field of view at f/5. The two-mirror optical design includes two transmitting correcting elements. To avoid excessive central obstruction of the entrance pupil, a conical baffle is necessary in addition to the usual primary and secondary baffles. This conical baffle is suspended approximately midway between the primary and secondary mirrors. In addition, an exterior close-fitting wind and light baffle, not found on most modern telescopes, blocks rays at large angles from the field of view. The baffle design was analyzed using stray light analysis software. Scattered light as a function of source angle was calculated and the dominant scattering surfaces were identified. For sources near the field of view, the uniformity of scattered light over the focal surface was determined.

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