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Observatories > The largest refractors

The largest refractors



 Diameter of the lens  
(in cm)
 Focal length  
(in m)
 Observatory  Site   Date of first observation 
102 19,4  Yerkes Williams bay, Wisconsin, USA 1897
91 17,6 Lick Mt Hamilton, California, USA 1888
83 et 62 16,2 Paris Meudon, Hauts de Seine, France 1891
80 12,0 Potsdam Potsdam, Germany 1899
76 17,9 Côte d'Azur Nice, Alpes Maritimes, France 1887
76 14,1 Allegheny Pittsburgh, Pennsylvania, USA 1914 and 1985
71 8,5 Royal Greenwich Greenwich, Londres, UK 1894
69 10,5 Vienna Vienna, Autriche 1878
68 21,0 Berlin Berlin, Treptow, Germany 1896
67 10,9 Johannesburg Johannesburg, South Africa 1925
67 9,9 Mc Cormick Mt Jefferson, Charlottesville, Virginia, USA 1883
66 10,8 Mt Stromlo Mt Stromlo, Australia 1925
66 9,9 U.S. Naval Washington, D.C., USA 1873
66 6,8 Royal Greenwich Greenwich, Londres, UK 1897
66 9,9 Pulkovo Saint-Petersburg, Russia 1912

Below, Europe at night showing the light pollution.
Finding a favorable site for astronomical observation is now difficult in Europe.
The existing telescopes must observe only bright objects.

Credit : DR