我们把内调焦望远镜在调焦过程中分划板十字丝中心物方共轭点的轨迹称为“准线”。准线理应是一条沿光轴的立线,但由于镜管零部件的误差(系统的与偶然的),实际准线将是各式各样的空间曲线(图1①②③等等)一切可能的实际准线将被限制在沿光轴的细长曲面回转体内。实际准线偏离某一作为基准准线的空间立线的程度称为“准线误差”,它可以用线量或角度表示。经纬仪 We refer to the trajectory of the conjugate point of the object side of the cross reticle in the focusing process of the focusing telescope as a “guide line”. The guideline should be a vertical line along the optical axis but due to the errors (both systematic and accidental) in the tube components, the actual alignment will be a wide range of spatial curves (Figure 1①②③ etc.) All possible realities The guideline will be limited to the slender curved surface revolving body along the optical axis. The extent to which the actual alignment deviates from a certain spatial vertical as the reference is called “alignment error” and can be expressed in terms of the amount of wire or angle. Theodolite