ESO and AMOS sign contract for the VLTI Auxiliary Telescopes

This photo shows a model of an Auxiliary Telescope during Observing Conditions. The 1.8-m telescope (with an Alt-Az mount, i.e. exactly like the Unit Telescopes) is rigidly anchored to the ground by means of a special interface. The light is directed via a series of mirrors (the Coudé Optical Train) to the bottom of the Telescope. From the Coudé Relay Optics it is sent on to the underground Delay Line Tunnel.