under a cost-sharing agreement.

There are a variety of optical and near-infrared instruments available for the 3.5 m telescope, including:
* The ARC echelle spectrometer (ARCES) uses a 2048 × 2048 pixel CCD and has a resolution of .
* The Double Imaging Spectrometer (DIS) is a low-resolution optical spectrometer.
*KOSMOS, on long-term