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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 Schiefspiegler ： ウィキペディア英語版 Schiefspiegler The Schiefspiegler (lit. ''oblique mirror'' in German) also called tilted-component telescopes (TCT) are a type of reflecting telescope featuring an off-axis secondary mirror, and therefore an obstruction-free light path. This is accomplished by tilting the primary mirror so that the secondary mirror does not block incoming light. William Herschel was one of the first to have tilted the mirror of his telescope in order to avoid light loss due to the low reflectivity of his speculum-metal mirror.〔Rutten, H., & Venrooij, M. (1999). Telescope optics: A comprehensive manual for amateur astronomers (4th print. ed., p. 117). Richmond, Va.: Willmann-Bell.〕 Schiefspieglers offers a significant increase in contrast, which is useful for instance for planetary study.〔Texereau, J. (1957). How to make a telescope (p. 400). New York: Interscience.〕 Tilting the mirrors cause severe coma and astigmatism, however as Anton Kutter showed in the 1950s, by a suitable choice of radii these aberrations can be corrected to an acceptable level. ==References== 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「Schiefspiegler」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.