urn:nasa:pds:context:instrument:mdm.markiii 1.0 1.10.0.0 Product_Context 2020-09-09 1.0 Initial export from OLAF urn:nasa:pds:context:telescope:mdm.hiltner2m4 instrument_to_telescope urn:nasa:pds:context:telescope:mdm.tinsley1m3 instrument_to_telescope Mark III Spectrograph Spectrometer 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.