Porro Prism. Porro prism optical design. Prism Type. Closed Bridge. 367' field of view at 1000 yards, 52.1° apparent angle of view. Minimum Focus Distance. -1.0' @ 1000 yd / -.3 m @ 1000 m. 9.3 - 10.9 mm / 23.6 - 27.6".
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