The 3D Series Riflescopes are designed to be extremely rugged and dependable, yet lightweight to carry. The 3D Series Riflescopes advanced optical systems provide crystal clear images with exceptional depth and dimension. They feature fully multicoated lenses that allow maximum light transmission, even in low light conditions. The 3D Series Riflescopes (6-18x50mm with Mildot Reticle) feature one-piece/1-inch aluminum tube construction to reduce weight. The 6-18x50mm Riflescope provides a 1/8" MOA (minute of angle) and a convenient side focus. Eye relief is a comfortable 4". The 3D Series Riflescopes are all shockproof, waterproof and fog proof, which allow superior performance in all outdoor conditions and terrain.