1 June 1994 FORS: a workhorse instrument for the ESO VLT
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The design and the expected performance of the FOcal Reducer/low- dispersion Spectrograph (FORS) for the Very Large Telescope (VLT) of the European Southern Observatory (ESO) are described. FORS is an all dioptric focal reducer designed for direct imaging, low- dispersion multi-object spectroscopy (MOS), imaging polarimetry and spectro-polarimetry of faint objects in the spectral range from 330 nm to 1.1 (mu) $m. The field of view is 6.83 X 6.83 arcmin2 with an image scale of 0.2 arcsec/pixel. To take full advantage of excellent seeing, a configuration with an image scale of 0.1 arcsec/pixel can be selected. In the MOS mode, simultaneous spectroscopy of up to 19 objects is possible. Two copies of the instrument (denoted `FORS I' and `FORS II', respectively) are under construction and will be installed at the Cassegrain foci of the VLT unit telescope Nos. 1 and 3.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Walter Seifert, Walter Seifert, Wolfgang Mitsch, Wolfgang Mitsch, Harald E. Nicklas, Harald E. Nicklas, Gero Rupprecht, Gero Rupprecht, "FORS: a workhorse instrument for the ESO VLT", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176750; https://doi.org/10.1117/12.176750


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