The Vacuum Tower Telescope is an evacuated-optics solar telescope located at the Teide Observatory on Tenerife in the Canary Islands. It is operated by the Kiepenheuer-Institut für Sonnenphysik (KIS).
The VTT at the Teide Observatory, Tenerife.
Vacuum Tower Telescope
Close view of VTT
A solar telescope is a special purpose telescope used to observe the Sun. Solar telescopes usually detect light with wavelengths in, or not far outside, the visible spectrum. Obsolete names for Sun telescopes include heliograph and photoheliograph.
The Swedish 1-m Solar Telescope at Roque de los Muchachos Observatory, La Palma in the Canary Islands.
Example of amateur solar telescope equipped with a hydrogen-alpha filter system.