polarizing beam splitter. The total system uses three 1k × 1k Sarnoff CCDs, two are used for direct narrow-band observations and the third is collecting simultaneous wide-band images. TRIPPEL The TRI-Port Polarimetric Echelle-Littrow (TRIPPEL) is a Littrow spectrograph using a 79 grooves/mm echelle grating with a blaze angle of 63.43 degrees. TRIPPEL's wavelength range is about 380–1100 nm, and it has a moderate resolution for a solar telescope, with R being approximately 200,000. This corresponds to about 1.3 km/s on the solar surface. TRIPPEL has a number of key useful features. It allows simultaneous observations at 3 different wavelengths, can in principle exploit the full spatial resolution of the SST, and has good polarimetric properties. See also List of solar telescopes Dutch Open Telescope References External links Information on the SST from the Institute for Solar Physics Information on the SST at the Institute for Solar Physics wiki SST APOD pictures of a sunspot, the Venus transit, spicules on the solar surface, and bright points in the solar granulation. APOD picture of the Roque de los Muchachos Observatory. The SST is the third from the right. Astronomical observatories in La Palma Solar telescopes