VORTEX CROSSFIRE II 4-16X50 BDCWith long eye relief, a fast focus eyepiece, fully multi coated lenses and resettable MOA turrets, there's no compromising on the Crossfire II. Clear, tough and bright, this riflescope hands other value priced riflescopes their hat. The hard anodized single piece aircraft grade aluminum tube is nitrogen purged and o ring sealed for waterproof fogproof performance. Magnification 4 16x Objective Lens Diameter 50 mm Eye Relief 3. 7 inches Field of View