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在制作光学零件及装配光学系统时,其表面及组件定会产生偏心,从而导致像差而使光学系统的像质变坏。同心光系统的像差沿孔径角和视场角分解成级数形式,对此级数进行微分,即可求得由偏心引起的像差。微分时,相应像差降一次幂。因此,偏心引起的像差是偶次像差。对多数光学系统而言,当其表面存在偏心时,具有重要意义的是其中心像点出现彗差〔5〕。对中心像点二级彗差的研究详见参考资料〔2〕。该像差类似同心光学系统的三级
When manufacturing optical components and assembling optical systems, the surfaces and components of the optical components are set to be eccentric, resulting in aberrations that deteriorate the image quality of the optical system. The aberration of the concentric optical system is decomposed into series forms along the aperture angle and the angle of view, and the differential caused by the eccentricity can be obtained by differentiating the series. When differentiated, the corresponding aberration decreases by a power. Therefore, aberration caused by aberration is even-order aberration. For most optical systems, when there is an eccentricity on the surface, it is of great importance that coma appears at the center of the image [5]. The center of the point two coma study see reference [2]. The aberration is similar to that of a concentric optical system