Inside the TNG optical laboratory, the new instrument (Fizeau interferometer) is tested before mounting it on the telescope. The TNG (Telescopio Nazionale Galileo) is a 3.58-meter Italian telescope, located at the "Roque de los Muchachos" Observatory on the island of La Palma in the Canary Islands, Spain. The TNG is operated by the "Fundación Galileo Galilei" on behalf of the Italian National Institute of Astrophysics (INAF). Image taken on June 1, 2009 inside the TNG optical laboratory.
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