Mark III Spectrograph
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Low-resolution grism spectrographs (a pair of essentially identical instruments) used on the 1.3 m McGraw-Hill and 2.4 m Hiltner telescopes at MDM Observatory on Kitt Peak.
The spectrograph was equipped with either a SITE 1024 x 1024 thinned, backside illuminated CCD (with 24-micron pixels), or a Loral 2048 x 2048 thick, front-side illuminated CCD (with 15-micron pixels). The spectrograph was used with a low-resolution grism (150 lines per mm,    
blazed at 0.73 micron), giving a dispersion of roughly 0.001 micron per pixel.