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4. What is a pentaprism? What job does it do in the camera?

User JayGatsby
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A Pentaprism is five sided and a prism with two silvered surfaces giving a never ending light of rays of light through 90 degrees.

User Soulshake
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Pentaprism is a five sided prism with two silvered surfaces giving a non-stop deviation of all rays of light through 90 degress. Used in viewfinders of single-lens reflex cameras 
User Tekito
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