五面镜不是用一整个玻璃棱镜，而是用3块镜子来达到相同的目的。
Instead of the solid block of glass of the prism in pentaprism system, here 3 simple mirrors are used to perform the same task.
五面镜不是用一整个玻璃棱镜，而是用3块镜子来达到相同的目的。
Instead of the solid block of glass of the prism in pentaprism system, here 3 simple mirrors are used to perform the same task.
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