Vortex Optics Diamondback 8.5x50 Roof Prism Binocular http://www.amazon.com/gp/product/B002M2XUOC?tag=sukses2015-20 Fully Multi-Coated - Lenses Increase light transmission with multiple anti-reflective coatings on al Phase Correction - Used on roof prism models onlycoating enhances resolution and contrast Roof Prisms - Valued for greater durability and a more compact size Waterproof - Optics are sealed with O-rings to prevent moisture dust and debris from getting insid Fogproof - Argon gas purging guarantees superior fogproof and waterproof performance
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