DECam is a high-performance, wide-field CCD imager mounted at the prime focus of the Blanco 4-m telescope at CTIO. DECam imager contains 62 science CCDs with 520 megapixels and images 3 square degrees (2.2 degree wide field) at 0.263 arcsecond/pixel resolution.
COSMOS is the CTIO Ohio State Multi-Object Spectrograph, an imager and low- to moderate-resolution spectrograph covering from approximately 3500 Å to 10000 Å. COSMOS has an approximately 10 arcminute circular field of view, at a scale of 0.29” per pixel.
ARCoIRIS is an infra-red imaging spectrograph. It is a cross-dispersed, single-object longslit imaging spectrograph, containing no moving parts. It features a fixed slit assembly of dimensions 1.1-arcsecs by 28-arcsecs. Spectra cover a simultaneous wavelength range from 0.80 to 2.47 microns, at a spectral resolution of approx 3500, encompassing the entire z'YJHK photometric range.