Compact and lightweight, the Nikon 10x25 Trailblazer ATB Binoculars are ideal companions for watching birds and wildlife on the trail, your favorite team at the stadium, or just sightseeing around town.The combination of high-index BAK4 roof prisms and anti-reflection fully multi-coated optics work together to maximize light transmission to offset the dimming often associated with high-power optics with smaller objectives—ensuring bright and clear high-contrast images with accurate color fidelity across its generous field of view.Complementing the optics are design details that make the Trailblazer comfortable and easy to hold. The bridge is built with dual hinges that allow the optical tubes to fold under it to minimize the footprint to take up as little space as possible when stored in your pack, pocket, purse, or glove box. The binoculars' polycarbonate chassis helps to reduce the weight without sacrificing strength or stability, and they are wrapped in a protective rubber armor that provides a secure slip-resistant grip even in cold and wet weather. To withstand the rigors of being exposed to the elements, the optical tubes are nitrogen filled and O-ring sealed to be waterproof and resistant to internal fogging.Optical Performance10x magnification allows for detailed observations of distant subjects25mm objective lenses help to produce a compact form factorRoof prism optical path ensures a low-profile design that is easy to holdHigh-index BAK4 prisms deliver a round exit pupil and a crisp and clear image with limited edge distortionAnti-reflection fully multi-coated optics maximize light transmission for brighter views and improved color fidelity and contrastApparent angle of view approaches wide angle to minimize the appearance of distracting hand shake that is common when holding high-power optics and to present an immersive observational experienceGenerous 342' field of view at 1000 yardsUse and HandlingClosed-bridge configuration provides a stable platform for the internal focusing mechanismLow-profile center focusing wheel helps to maintain a compact form and minimizes snagging hazardRight-eye dioptric correction allows users to compensate for optical prescription for sharper viewsBroad 56-72mm interpupillary adjustment distance for easy use by a wide variety of people—especially those with narrow faces such as children and adolescentsTwist-up rubber eyecups for easy use with or without eyewear10mm eye relief2.5mm exit pupilConstruction DetailsEnvironmentally friendly prisms and lenses feature Eco-Glass, which is made without lead or arsenicDual-hinge design allows the optical tubes to fold under the bridge when closed to minimize the form factor for easier storage and carryingLightweight and impact-resistant polycarbonate chassisChassis material is temperature resistant, preventing the expansion and contraction that is common with metal, which can cause the optical components to move out of alignment over time and prevent sharp focusNitrogen filled and O-ring sealed to be waterproof and resistant to internal fogging when moving through extreme changes in temperature and environmental conditionsProtective rubber armor provides a slip-resistant gripLightweight 9.9 oz