The William Herschel Telescope is situated on the island of La Palma just off the coast of North Africa. It is one of the Isaac Newton Group of telescopes, and is a 4.2 metre Alt-Az telescope with gravity stable platforms at the level of the Altitude bearings, known as Nasmyth stations. On one of the Nasmyth platforms is an enclosed laboratory for high-resolution imaging, the GHRIL, which is an ideal location for the NAOMI adaptive optics system and for the planned Laser Guide Star upgrade.

The dome and control rooms of the William Herschel Telescope, one of the Isaac Newton Group on the Island of La Palma.

The William Herschel Telescope, as seen from the Cassegrain floor of the dome. The large brown cabin on the right is the GHRIL Nasmyth focus station, where the NAOMI Adaptive Optics instrument will be situated.