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.
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。
Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.
球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。
This phenomenon is called a chromatic aberration; another example of this effect is seeing a rainbow when you shine white light through a prism.
这种现象叫做“色差”（chromatic aberration）；这种效应的另一个例子是，当你将白光照射棱镜时便可以看到彩虹。
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