五棱镜是单反相机取景的反光装置，其作用是将对焦屏上左右颠倒的图像矫正过来，使取景看到的图像与直接看到的景物方位完全一致，使操作者能够正确地取景和对焦。在快门开启时，反光镜向上翻让出光路，五棱镜中不透光。
n. pentaprism
... Love will come set me free 爱会让我自由 Prison walls still standing tall 监狱高墙耸立 Some things never change at all 有些事永远不变 ...
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The standard plane is generated using laser,pentaprism and rotary table ,and the detector is PSD. The flatness information is got by measuring the discrepancies of the measuring points and standard plane.
该仪器采用了激器、五棱镜与转台组合产生基准平面,以PSD作为探测器;通过测量被测点与基准面的高度差获取平面度数据。
参考来源 - 激光平面度仪的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
介绍了用五棱镜法检测大口径光束平行度的原理。
The detection concept for large diameter beam parallelism with penta prism is introduced.
介绍了选择五棱镜的方法和减小面形误差影响的方法。
The methods for selecting penta prism and reducing the effect of surface profile error on detection are introduced.
该GF1系列没有离开的五棱镜上找到其他标准的可互换镜头相机。
The GF1 does away with the pentaprism found on other standard interchangeable lens cameras.
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