XD Lens Elements - Extra-low dispersion XD glass increases resolution and color fidelity resultin XR Lens Coatings - Vortex proprietary XR fully multi-coated lens coatings increase light transmissio 30 mm Tube - Provides greater strength and wider adjustment lattitude One-Piece Tube - Maximizes alignment for improved accuracy and optimum visual performance as well as Aircraft-Grade Aluminum - Construction from a solid block of aircraft-grade aluminum delivers increa :
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