The 1.52 m (60 in) UMN-MLOF (University of Minnesota Mount Lemmon Observing Facility) telescope began operating in 1970. It is a Dall-Kirkham optical/near infrared and is of the same general design as the 1.5 m Steward telescope and another at San Pedro Mártir. The original metal mirror performed poorly and was replaced with a Cer-Vit mirror in 1974. The University of California, San Diego (UCSD) was originally a partner of UMN in operating the telescope.
The 1.02 m (40 in) CSS (Catalina Sky Survey) reflecting telescope is an unusual Pressman-Camichel design and is used to provide automated follow up observations of newly discovered near-Earth objects. It was originally located at Catalina Station and was moved to MLO in 1975. It was refurbished in 2008 and placed in a new dome in 2009 before being integrated into CSS operations.
Comet ISON (C/2012 S1) as seen on October 8, 2013 with the Schulman Telescope (recorded with STX-16803 CCD camera)
The 0.81 m (32 in) Schulman Telescope is a Ritchey-Chrétien reflector built by RC Optical Systems and installed in September 2010. It is operated by the Mount Lemmon SkyCenter and is Arizona's Largest dedicated public observatory. The Schulman Telescope was designed from inception for remote control over the internet by amateur and professional astrophotographers worldwide, and is currently the world's largest telescope dedicated for this purpose.
A 0.7 m (28 in) reflecting telescope installed in 1963 at Catalina Station was moved to MLO in 1972.
^ abSonett, C. P. (1976). "University of Arizona, Department of Planetary Sciences and Lunar and Planetary Laboratory, Tucson, Arizona. Observatory report covering the period from 1 October 1974 to 30 September 1975". Bulletin of the Astronomical Society. 8: 11. Bibcode:1976BAAS....8...11S.
^Hubbard, William B. (1978). "University of Arizona, Department of Planetary Sciences/Lunar and Planetary Laboratory, Tucson, Arizona. Report from 1 October 1976 to 30 September 1977". Bulletin of the Astronomical Society. 10: 16. Bibcode:1978BAAS...10...16H.