Telecentric lens has parallel chief ray with its optical axis and is ideal for co-axial lighting.
远心镜头拥有与它的光轴平行的主光线，同轴照明是非常理想的。
The instrument for measuring the parallel of the multi?axis optical system with video output was designed.
设计了用于测量输出为视频图像信号的多光轴光学系统的光轴平行度校正仪器。
The error analysis shows that the present indexing method seems to be available to the cases of the zone axis both parallel and inclined to the optical axis of SEM.
误差分析表明，本注释方法不但适用于晶带轴平行于扫描电镜光轴的情况，而且适用于晶带轴倾斜于光轴的情况。
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