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List of largest optical refracting telescopes

Here is a list of the largest optical refracting[?] telescopes sorted by lens diameter.

Observatory	Lens diameter	Focal length	Built	Comments
Yerkes Observatory (Williams Bay, Wisconsin, USA)	1.02 m	19.4 m	1897
Lick Observatory (Mount Hamilton, California[?], USA)	0.91 m	17.6 m	1888
Paris Observatory[?] (Meudon, France[?])	0.83 m + 0,62 m	16.2 m	1891
Potsdam Observatory[?] (Potsdam, Germany)	0.80 m	12.0 m	1899
Côte d'Azur Observatory (Nice, France)	0.76 m	17.9 m	1887
Allegheny Observatory[?] (Pittsburgh, Pennsylvania, USA)	0.76 m	14.1 m	1914
Royal Greenwich Observatory (Greenwich, London, England)	0.71 m	8.5 m	1894
Vienna Observatory[?] (Vienna, Austria)	0.69 m	10.5 m	1878
Berlin Observatory[?] (Berlin, Germany)	0.68 m	21 m	1896
Johannesburg Observatory[?] (Johannesburg, South Africa)	0.67 m	10.9 m	1925
McCormick Observatory[?] (Mount Jefferson, Virginia[?], USA)	0.67 m	9.9 m	1883
Royal Greenwich Observatory (Greenwich, London, England)	0.66 m	6.8 m	1897
U.S. Naval Observatory (Washington, DC, USA)	0.66 m	9.9 m	1873
Mount Stromlo Observatory[?] (Mount Stromlo, Australia[?])	0.66 m	10.8 m	1925	Previously located in South-Africa. Relocated in Australia in 1952 Destroyed by bush fire on January 18, 2003

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