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DSLR viewfinder types compared: Porro-mirror vs Pentaprism. Porro and Pentaprism DSLR viewfinders differ in mirror movement, viewfinder position, and body design. The Olympus E‑300’s Porro system has a lateral mirror path, an offset viewfinder, and a flat top, while the Nikon D90’s Pentaprism uses a direct mirror lift, central eyepiece, and a characteristic prism hump. The Pentaprism viewfinder is brighter and larger, whereas the Porro viewfinder is dimmer and smaller. #porroprism #porromirror #

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