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望远镜[Telescope] [2005-10-4]
iamet 发表在 ¤〖天文〗
| Reflecting telescopes (called "reflectors") come in five main configurations: prime focus, Newtonian, Cassegrain, Coudé, and Schmidt camera. The Ritchey-Chrétien design is also used.
Refracting telescopes (called "refractors") were invented in 1609. They suffer from chromatic aberration and are no longer in widespread use at research observatories. However, as a result of their superiority to reflectors for visual planetary observation because of slower f-ratios and better optics, the amateur community uses refractors extensively.
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学好数理化，走遍天下都不怕！ | |
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