case of the MOS) with each microlens covering an hexagonal region of 0.62 arcsec in diameter. CanariCam The University of Florida's CanariCam is a mid-infrared imager with spectroscopic, coronagraphic, and polarimetric capabilities. Since 2012, it had been operating in queue mode at one of the Nasmyth focus stations, until it was temporarily decommissioned in April 2016. Following an upgrade project, started in mid-2018, it has been installed and recommissioned (December 2019) on a different folded-Cassegrain focus providing superior performance with the instrument. CanariCam is designed as a diffraction-limited imager. It is optimized as an imager, and although it will offer a range of other observing modes, these will not compromise the imaging capability. CanariCam works in the thermal infrared between approximately 7.5 and 25 μm. At the short-wavelength end, the cut-off is determined by the atmosphere—specifically atmospheric seeing. At the long wavelength end, the cut-off is determined by the detector; this loses sensitivity beyond around 24 μm, although the cut-off for individual detectors varies significantly. CanariCam is a very compact design. It is expected that the total weight of the cryostat and its on-telescope electronics will be under 400 kg. Most previous mid-infrared instruments have used liquid helium as a cryogen; one of the requirements of CanariCam was that it should require no expensive and difficult to handle cryogens. CanariCam uses a two-stage closed cycle cryocooler system to cool the cold optics and cryostat interior down to approximately , and the detector itself to around , the temperature at which the detector works most efficiently. CanariCam has been decommissioned . OSIRIS The IAC's OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy), is an imager and spectrograph covering wavelengths from 0.365 to 1.05 µm. It has a field of view (FOV) of 7 × 7 arcmin for direct imaging, and 8 arcmin × 5.2 arcmin for low resolution spectroscopy. For spectroscopy, it offers tunable filters. See also Other observatory sites La Silla Observatory Mauna Kea Observatories Paranal Observatory Lists and comparisons Extremely large telescope List of largest optical reflecting telescopes List of largest optical telescopes historically References External links Gran Telescopio Canarias GTC News Instituto de Astrofísica de Canarias (IAC) University of Florida CanariCam Consejo Nacional de Ciencia y Tecnología de México Instituto de Astronomía de la Universidad Nacional Autónoma de México CBC article—Giant Canary Islands telescope captures first light Images Gran Telescopo Canarias inauguration press dossier (in English)