A suite of optical technologies is brought to bear that are designed to complement each other and enhance your view. First is the use of the HDX optical system, which is composed of extra-low dispersion (ED) and high-transmittance (HT) glass, which minimizes optical distortion and light absorption to transmit bright and clear images. Next Sig employs ultra-wide broadband, anti-reflection SpectraCoat lens coatings, along with protective LenShield and LensArmor coatings. This combination of glass and lens coatings produces high-resolution and high-contrast views in all light conditions. The front of the objective has threads for filters—like polarizing or ND—to enhance the views, especially when operating in snowy conditions or on/near water.
The reticle, located on the second focal plane, features Sig's fiberoptic HellFire illumination system, which provides nine selectable intensity levels from two dim settings that are night vision (NVD) compatible all the way up to a bright setting that makes the center aiming dot clearly and distinctly visible in full daylight. A motion detection system, MOTAC, automatically activates the illuminated portion of the reticle when the weapon is shouldered and powers it down when it senses inactivity after 2 minutes—ensuring a long battery life and instant illumination when you need it. Exposed tactical turrets provide a precise 1/4 MOA per click impact point correction with a wide 70 MOA adjustment range on the elevation turret. To further improve accuracy, a free elevation Sig Ballistic Turret (SBT) dial is included with the scope. Simply fill out the form that comes with the scope and you'll receive a custom dial that is matched to your rifle and load and provides the correct ballistic drop compensation (BDC) at any range. You get one free with your scope purchase and you can order others for different rifles at an additional cost.
To withstand the repeated recoil of regular use and to provide the adjustment room required for the windage and elevation turrets, the one-piece maintube is made of lightweight but strong aluminum and is robust at 30mm in diameter. The housing is nitrogen filled and O-ring sealed to an IPX7 rating to make it waterproof, submersible, and resistant to internal fogging.
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