翻訳と辞書 Words near each other ・ Lens adapter ・ Lens Annab ・ Lens board ・ Lens clock ・ Lens Controller ・ Lens cover ・ Lens Creek ・ Lens Express ・ Lens flare ・ Lens hood ・ Lens lantern ・ Lens mount ・ Lens Peak ・ Lens placode ・ Lens Records ・ Lens sag ・ Lens space ・ Lens speed ・ Lens, Belgium ・ Lens, Pas-de-Calais ・ Lens, Switzerland ・ Lens-Lestang ・ Lens.com, Inc. v. 1-800 Contacts, Inc. ・ Lensahn ・ Lensahn (Amt) ・ Lensbaby ・ Lensbury ・ Lensbury Sports Ground ・ Lensbygda ・ LensCrafters Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lens sag ： ウィキペディア英語版 Lens sag Lens sag is a problem that sometimes afflicts very large refracting telescopes. It is the equivalent of mirror sag in reflecting telescopes. It occurs when the physical weight of the glass causes a distortion in the shape of the lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by the entire opposite face, making mirror sag much less of a problem. One expensive solution to lens sag is to place the telescope in orbit around the Earth. The technical limit concerning lens sag was reached at the Yerkes refractor (1897) with an aperture of 40" (102 cm), where the sagging already causes small optical distortions. The 1890s therefore mark the end of the great refractors era. 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「Lens sag」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.