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At present, pentaprism is widely used. Pentaprism (roof-type pentaprism) is a common optical element in SLR cameras, while double pentaprism (two pentaprisms top to top) is used in construction measurement. combined) and a plumb line to mark the correct angle.We are an optical Penta prism manufacturing group in China that offer high-quality prism. If you need this product, please contact us right now!