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Difino
| • | Here is a list of the largest optical refracting telescopes sorted by lens diameter. The largest refractor ever constructed was French. It was on display at the 1900 Paris Exposition. Its tube was horizontal and the lens was stationary, prefigured so as to sag into the correct shape. The telescope was aimed with the aid of a Foucault sidérostat, which is a movable plane mirror of diameter 2 m (6.56 feet), mounted in a large cast-iron frame. The horizontal tube was 60 m (197 feet) long and the objective had 1.25 m (4.1 feet) in diameter. The results were poor. When the year-long exposition was over, its builders were unable to sell it. It was ultimately broken up for scrap.
Telescopes|*List of largest optical refracting telescopes
Source: [wikipedia: list of largest optical refracting telescopes]
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