Calar Alto observatory is a Spanish Singular Scientific and Technological Infraestructure (ICTS) located at Sierra de los Filabres, in Almería, Spain.
There are four telescopes of 3.5m, 2.2m, 1.23m and 0,8m mirror diameter, with a varied range of instruments. For the two larger telescopes (3.5m and 2.2m) Open Observing Time is offered through a biannual Call for Proposals. Director Discretionary Time is also available for short term observing programs.
Visiting astronomers will find at the observatory continuous sky quality monitors, lodging facilities and the required astronomical support for the optimal use of the telescopes.