ABSTRACT. We present the design and performance characteristics of the Near-Infrared Imager (NIRIM), which is a near-infrared camera operating in the 0.76[2.5 km wavelength range. NIRIM is an example of a cost-e †ective way to expand two telescopesÏ capabilities to infrared wavelengths. NIRIM has been used for photometry and wide-Ðeld imaging on our 1 m telescope at the Mount Laguna (8@ .5 ] 8@ .5) Observatory since 1995 August. In the future, NIRIM will also be used for high angular resolution imaging with the University of Illinois Seeing Improvement System (UnISIS), which is a laser guided adaptive optics system at the focus of the Mount Wilson 2.5 m telescope. coude