Largest primary mirror According to Official Guinness Records,
In terms of area, the Gran Telescopio Canarias is the largest primary mirror, with an effective aperture of 10.4 m (410 in). Also known as GranTeCan or GTC, it is based at the Roque de los Muchachos Observatory on the island of La Palma, in the Canary Islands, Spain. For a complete list of 2014 records, please visit 2014 Guinness Records in Spain .
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