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Glossary term: 折射式望遠鏡

Description: 折射式望遠鏡是一種使用透鏡作為主要集光元件的望遠鏡。折射式望遠鏡與反射式望遠鏡不同,後者使用反射鏡作為主要集光元件。折射式望遠鏡仍然是業餘愛好者常用的望遠鏡,通過特殊的鏡片組合(“消色差望遠鏡”)來校正不良的色彩效應,可以為目視觀測和天體攝影提供出色的圖像質量。在專業天文學領域,從20世紀初開始,折射式望遠鏡在很大程度上被反射式望遠鏡所取代。天文學家希望獲得更大的孔徑(透鏡或反射鏡直徑),但折射式望遠鏡的鏡片尺寸很難超過一米。這是因為透鏡僅允許在邊緣處有支撐,導致沉重的透鏡中心在重力作用下下垂,使透鏡的形狀和光學特性發生扭曲。

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