All SII binocular lenses and SIIILR binocular lenses are complimented with a special BAK-4 phase coated prism, to provide the ultimate performance at a reasonable price. Twist-up and twist down eyecups are standard on all SII Blue Sky and waterproof Binocular models. Simply twist down for eyeglass wearers and twist up for non eyeglass wearers. All SII and SIII series binoculars have fully-multi-coated objective and ocular lenses. This provides for maximum light transmission and superior resolution.
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