Under this condition, the stray light of a Cassegrain telescope comes from diffuse reflection of telescope tube wall, directly reflected light by a horseshoe mirror, diffuse reflection light by secondary mirror mount and is symmetrically distributed.

• 在这种条件下,卡塞 格伦望远镜系统杂散光成对称分布,主要来源于望远镜筒壁的漫反射光、马蹄镜的直接反射光和次镜支架的漫反射光。