ModelSA201Magnification7xObjective Lens Diameter50mmEyepiece Diameter23mmEye Relief 24mmExit Pupil7mmField Of View7°Field Of View (at 1000M)122m/1000mField Of View (at 1000yds)366ft/1000ydsMin. Focal length4mInterpupillary Dist58-72mmPrism SystemPorroPrism Glass MaterialBAK4Objective Lens Group2 group/3 piecesOcular Lens Group3 group/5 piecesLens CoatingFMCNet Weight970g / 2.14lb / 34.30ozDimension200x67x147mm / 7.87x2.64x5.79in