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Porro Prisms: This design has been a proven performer for over 100 years. The distinctive, off-set binocular housings accommodate two internal porro prisms which are used to elongate the light path to enable higher magnifications than primitive field or "opera" glasses. Porro prism binoculars typically deliver exceptionally high optical quality at more affordable prices than roof prism binoculars of the same power rating.
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