廉价快速压制非球面透镜色差、慧差、象散、桶形和枕形失真等图象缺陷是球面透镜不可避免的后果。过去，设计人员用一系列有象差的球面透镜进行互相抵消。除色差之外的所有缺陷都可用非球面避免。虽然非球面光学系统的设计已为现代计算方法大为简化，但非球面制造并不容易... Cheap and fast suppression of aspherical lens color aberration, coma, astigmatism, barrel and pincushion and other image defects spherical lens inevitable consequences. In the past, designers used a series of spherical aberration lenses to offset each other. All defects except color aberration can be avoided with aspheric surfaces. Although the design of aspheric optical systems has been greatly simplified for modern computing methods, aspheric manufacturing is not easy ...