The Mayall 4m Telescope (aka KPNO 4m, Kitt Peak 4m, or Nicholas U. Mayall Telescope) is a 4 meter Reflector Telescope at Kitt Peak National Observatory (KPNO). It was built in 1973
It was the model for the Víctor M. Blanco Telescope.
Víctor M. Blanco Telescope
Dark Energy Spectroscopic Instrument (DESI)
Deep Lens Survey (DLS)
NOAO Deep Wide-Field Survey (NDWFS)