FOCAS: The faint object camera and spectrograph for the Subaru telescope
Publications of the Astronomical Society of Japan, Volume 54, No. 6, Year 2002
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The Faint Object Camera and Spectrograph (FOCAS) is a Cassegrain optical instrument for the Subaru Telescope. Its capabilities include 6′φ FOV direct imaging, low-resolution spectroscopy (R = 250-2000 with 0″.4 slitwidth), multi-slit spectroscopy and polarimetry. We describe the overall design of FOCAS, its observing functions, and the performance verification procedures that have been carried out.