This Leupold Mark 4 12-40x60mm tactical spotting scope features include Xtended twilight lens system, DiamondCoat 2, folded light path, smooth focusing, waterproof, fog proof, fold down rubber eyecups, tripod and digital camera compatible, and BAK 4 prisms. FeaturesHunt further than ever into the evening with Leupold's Xtended Twilight Lens System. This system uses index-matched glass with wavelength-specific lens coatings to maximize the transmission of low-light wavelengths, resulting in better low-light details, clarity and quality. With most systems, scope manufacturers measure low light transmission at 550nm - the green color that the human eye is most sensitive to. However, in twilight conditions green can fade away and let blue/violet take over. Xtended Twilight is optimized to transmit blue and violet, giving the user best possible transmission of twilight images. DiamondCoat 2 ion-assist lens coatings provide the greatest level of abrasion resistance, exceeding military standards for hardness and durability. Folded Light PathSmooth FocusingArmor-coated100% Waterproof and Fog-ProofFold-down Rubber EyecupsTripod-ReadyDigital Camera CompatibleBAK 4 Prisms Leupold Mark 4 12-40x60mm TMR Spotting Scope 60040