A fast focal-reducing camera for CCD imaging

Details A fast focal-reducing camera for CCD imaging A fast focal-reducing camera for CCD imaging

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1296a&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Dec. 1991, p. 1296-1313. Research supported by Uni

Physics

Optics

7

Cameras, Cassegrain Optics, Charge Coupled Devices, Focal Plane Devices, Telescopes, Astronomical Observatories, Design Analysis, Performance Prediction

Scientific paper

This paper describes the design and performance of the OREAD focal-reducing camera, constructed for use at the Cassegrain focus of the Michigan-Dartmouth-MIT Observatory McGraw-Hill 1.3-meter telescope. OREAD is an all-refractive optical system providing a 50-mm collimated beam suitable for commercially available narrow-band filters or grisms. Its collimator and field lens are custom-made to decrease the severe coma which would otherwise be present at the extremities of its 30-arc-min field. When used with a CCD such as the TI 800 x 800, OREAD provides a field of view of 0.1 square degree at 1.5 arcsec/pixel. The focal ratio of OREAD of f/1.63 allows sky-limited narrow-band images to be obtained with exposures of only moderate duration. In an Appendix, some limitations inherent in coarsely sampled data obtained with CCDs are examined.

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