A secondary mirror (or secondary) is the second deflecting or focusing mirror element in a reflecting telescope. Light gathered by the primary mirror is directed towards a focal point typically past the location of the secondary. Secondary mirrors in the form of an optically flat diagonal mirror are used to re-direct the light path in designs such as Newtonian reflectors. They are also used to re-direct and extend the light path and modify the final image in designs such as Cassegrain reflectors.
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| - Fangspiegel (de)
- Sekundara spegulo (eo)
- Miroir secondaire (fr)
- Secondary mirror (en)
- 次鏡 (zh)
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| - Der Fangspiegel oder Sekundärspiegel ist ein optisches Bauteil in Spiegelteleskopen, das die vom Hauptspiegel (Primärspiegel) reflektierten Strahlen aus dem Fernrohrtubus heraus zum Okularstutzen (Beobachter, Kamera) oder zu den angeschlossenen Messinstrumenten lenkt. (de)
- En astronomio, la sekundara spegulo de teleskopo estas la dua spegulo sur kiu la lumo estas reflektita post esti resendita per la primara spegulo. Depende de la speco de teleskopo, la geometrio de tiu spegulo varias kaj ĝi povas esti ebena, parabola aŭ hiperbola. Kaze de Newton-a teleskopo aŭ dum observado ĉe la Cassegrain-fokuso, ĝi estas la lasta spegulo antaŭ la instrumentoj. (eo)
- En astronomie, le miroir secondaire d’un télescope est le second miroir sur lequel la lumière seréfléchit après avoir été renvoyée par le miroir primaire. Selon le type de télescope, la géométrie de ce miroir varie et il peut être plan, parabolique, ou hyperbolique. Dans le cas d’un télescope de Newton ou lors de l’observation au foyer Cassegrain c’est le dernier miroir avant les instruments.
* Portail de l’astronomie (fr)
- 次鏡是反射望遠鏡匯集和聚焦光線的第二面鏡子。主鏡收集的光線傳向焦點時，經過次鏡所在的位置是很典型的做法。次鏡調整光線或是朝向側面（牛頓望遠鏡）或是返回焦平面和穿過主鏡（卡塞格林反射鏡）…… 次鏡通常由X型的叉架（有時稱為蜘蛛架）支撐在光源和主鏡之間的光路上，但最重要的是不能導致影像的畸變。主鏡上的每一個點都會單獨的成像，當面積增加時就能使微弱的影相增加亮度，而不改變影像的形狀。也就是說，次鏡和他們的支撐架可能因為導致較小的畸變，來自明亮光源的輻射就會造成影像上常見的十字型"繞射尖刺"。 (zh)
- A secondary mirror (or secondary) is the second deflecting or focusing mirror element in a reflecting telescope. Light gathered by the primary mirror is directed towards a focal point typically past the location of the secondary. Secondary mirrors in the form of an optically flat diagonal mirror are used to re-direct the light path in designs such as Newtonian reflectors. They are also used to re-direct and extend the light path and modify the final image in designs such as Cassegrain reflectors. (en)
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| - Der Fangspiegel oder Sekundärspiegel ist ein optisches Bauteil in Spiegelteleskopen, das die vom Hauptspiegel (Primärspiegel) reflektierten Strahlen aus dem Fernrohrtubus heraus zum Okularstutzen (Beobachter, Kamera) oder zu den angeschlossenen Messinstrumenten lenkt. (de)
- En astronomio, la sekundara spegulo de teleskopo estas la dua spegulo sur kiu la lumo estas reflektita post esti resendita per la primara spegulo. Depende de la speco de teleskopo, la geometrio de tiu spegulo varias kaj ĝi povas esti ebena, parabola aŭ hiperbola. Kaze de Newton-a teleskopo aŭ dum observado ĉe la Cassegrain-fokuso, ĝi estas la lasta spegulo antaŭ la instrumentoj. (eo)
- A secondary mirror (or secondary) is the second deflecting or focusing mirror element in a reflecting telescope. Light gathered by the primary mirror is directed towards a focal point typically past the location of the secondary. Secondary mirrors in the form of an optically flat diagonal mirror are used to re-direct the light path in designs such as Newtonian reflectors. They are also used to re-direct and extend the light path and modify the final image in designs such as Cassegrain reflectors. The secondary is typically suspended by X-shaped struts (sometimes called a "spider") in the path of light between the source and the primary, but can be mounted on other types of mounts or optical elements such as optical windows, or schmidt and meniscus corrector plates. Employing secondary mirrors in optical systems causes some image distortion due to the obstruction of the secondary itself, and distortion from the spider mounts, commonly seen as cross-shaped diffraction spikes radiating from bright stars seen in astronomical images. (en)
- En astronomie, le miroir secondaire d’un télescope est le second miroir sur lequel la lumière seréfléchit après avoir été renvoyée par le miroir primaire. Selon le type de télescope, la géométrie de ce miroir varie et il peut être plan, parabolique, ou hyperbolique. Dans le cas d’un télescope de Newton ou lors de l’observation au foyer Cassegrain c’est le dernier miroir avant les instruments.
* Portail de l’astronomie (fr)
- 次鏡是反射望遠鏡匯集和聚焦光線的第二面鏡子。主鏡收集的光線傳向焦點時，經過次鏡所在的位置是很典型的做法。次鏡調整光線或是朝向側面（牛頓望遠鏡）或是返回焦平面和穿過主鏡（卡塞格林反射鏡）…… 次鏡通常由X型的叉架（有時稱為蜘蛛架）支撐在光源和主鏡之間的光路上，但最重要的是不能導致影像的畸變。主鏡上的每一個點都會單獨的成像，當面積增加時就能使微弱的影相增加亮度，而不改變影像的形狀。也就是說，次鏡和他們的支撐架可能因為導致較小的畸變，來自明亮光源的輻射就會造成影像上常見的十字型"繞射尖刺"。 (zh)
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