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Optical Material: BK7 optical glass Multi-coated optics 60/40 scratch/dig quality Surface Flatness: λ/2 The porro-abbe prism is used to bend an image 90 degrees and rotate a vertical image horizontally. Porro-abbe prisms are also called double right-angle prisms. Two of them can be used to make an erecting system that are used in many models of binoculars and some telescopes. 2-3 of these prisms make for a great addition to any optical hobbyist's collection and add many possibilities for experimentation.
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