In order to correct reasonably the image lean, the distortion caused by a reflecting prism with a second parallelism in a collimated beam and the image lean introduced by it were presented.

• 为合理地校正反射棱镜制造误差产生的像倾斜，文中讨论了棱镜存在第二光学平行度并处于平行光路中时所产生的畸变像差，以及由此畸变引起的像倾斜。