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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク List of largest optical refracting telescopes ： ウィキペディア英語版 List of largest optical refracting telescopes Here is a list of the largest optical refracting telescopes sorted by lens diameter and focal length. The largest practical functioning refracting telescope is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century. Most are classical Great refractors, which used achromatic doublets on an equatorial mount. However, other large refractors include a 21st-century Solar telescope which is not directly comparable because it uses a single element non-achromatic lens, and the short-lived Great Paris Exhibition Telescope of 1900. It used a 78-inch (200 cm) Focault siderostat for aiming light into the Image-forming optical system part of the telescope, which had a 125 cm diameter lens. Using a siderostat incurs a reflective loss. Larger meniscus lenses have been used in later catadioptric telescopes which mix refractors and reflectors in the image-forming part of the telescope. As with reflecting telescopes, there was an ongoing struggle to balance cost with size, quality, and usefulness. == See also == * List of largest optical reflecting telescopes * List of largest optical telescopes in the 20th century * List of largest optical telescopes in the 19th century * List of largest optical telescopes in the 18th century 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of largest optical refracting telescopes」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.