一、前言透过率是照相物镜、电影摄影物镜等光学系统的一项重要性能指标,其定义为出射光通量与入射光通量之比。透过率的定义和测量方法虽然十分简单、直观,但是在实际测试中却往往由于不注意其严谨的定义和不明确其严格的测量条件,致使测量结果没有良好的重复性。这当中,尤 I. INTRODUCTION Transmittance is an important performance index of optical systems such as photographic objectives and movie photography objective lenses. It is defined as the ratio of outgoing flux to incident flux. Although the definition and measurement of transmittance are very simple and intuitive, they often do not have good repeatability due to their strict definition and uncertainty of their strict measurement conditions in actual tests. Among these, especially