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List of largest optical telescopes historically : ウィキペディア英語版 | List of largest optical telescopes historically Telescope performance has progressed in many ways since their invention in 1608. The following tables list those steps in performance. == By Overall Aperture == The following is a list of largest single mount optical telescopes sorted by total objective diameter (''aperture''), including segmented and multi-mirror configurations. It is a historical list with the instruments listed in chronological succession by objective size. Diameter of the primary optics alone can be poor measure of a telescope's historical or scientific significance; for example, William Parsons, 3rd Earl of Rosse's 72-inch (1.8 m) reflecting telescope did not perform as well (i.e. gather as much light) as the smaller silvered glass mirror telescopes that succeeded it because of the poor performance of its speculum metal mirror.
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