The relation between parallelism of two beams from exit pupil and parallelism of two optical axises of binocular telescope is presented in the paper, so does their difference of measurement method.

• 简要地阐述平行光束通过双筒望远镜后，自出瞳射出的左、右两光束平行度与双筒望远镜左、右两光学系统光轴平行度之间的关系及其测量方法的差异。