色差-经常在折射望远镜的物镜上出现，是因为透镜不能把不同波长(颜色)的光聚焦到一点而形成的。
Chromatic Aberration — usually associated with objective lenses of refractor telescopes, is the failure of a lens to bring light of different wavelengths (colors) to a common focus.
下班后，他用透镜制作望远镜。
这种类型的望远镜称为反射望远镜，比折射望远镜更具有优势，后者需要用到两个透镜，而且会受到光学畸变效应的影响。
Such telescopes are called reflectors, and they offer major advantages over refractors, which use two lenses and suffer from optical distortion effects.
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