XD™ Lens Elements Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images. XR™ Fully Multi-Coated Proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. First Focal Plane Reticle Scale of reticle remains in proportion to the zoomed image. Constant subtensions allow accurate holdover and ranging at all magnifications. Glass-Etched Reticle Allows for intricate reticle design. Protected between two layers of glass for optimum durability and reliability. Illuminated Reticle Provides precise aiming under low-light conditions