Specifications for Athlon Optics Midas M5 Magnifier: Magnification: 5 x Objective Lens Diameter: 27.2 mm Eye Relief: 2.5 in Length: 3.7 in Weight: 11.6 oz Field of View, Linear: 23 ft at 100 yds Optical Coating: Fully Multicoated Weather Resistance: Yes Height: 1.39 in Color: Black Water Resistance Level: Waterproof Features of Athlon Optics Midas M5 Magnifier ---Fully Multicoated: Fully Multicoated optics effectively reduces reflected light and increases the transmission of light giving you a brighter image than normal single coated lenses. ---Aircraft Aluminum: The aircraft grade aluminum that has exceptional strength and superior mechanical integrity will protect these world class optics no matter what punishment you throw at it. ---One Piece Chassis Construction: Heat treated one piece Chassis gives the scope extra strength.