The BX-4 Pro Guide HD Gen 2 10x42mm is a jack-of-all-trades when it comes to backcountry optics. Compact and lightweight it has enough field of view for navigating tight areas while still offering plenty of magnification for wide-open spaces. - This upgraded version of our best-selling binocular uses high-quality glass and improved lens coatings to deliver the resolution clarity and glare reduction diehard hunters and shooters demand no matter the time of day you'll be able to conquer the challenges of harsh light and bright reflections. - Along with its outstanding optical system the BX-4 Pro Guide HD Gen 2 includes interchangeable Form-Fit eyecups that'll keep your eyes fresh through hours of hillside glassing. - Elite Optical System - Open Bridge Roof Prism Design - Diamond Coat 2 - Fully Multi-coated Lens System - Guard-ion - High Definition - Phase Coated - Tripod Ready - Armor Coated - Ergonomic Design - Over-sized Eyepiece - Smooth Central Focusing Dial - Twist Up Eyecups - Field Replaceable Eyecups - Interchangeable Form-Fit Eyecups - Waterproof and Fogproof - Locking Diopter Adjustment - Specifications - Length (in) 5.7 - Weight (oz) 25 - Magnification 10 - Objective Lens Diameter (mm) 42 - Linear FOV (ft@1000 yd) 314 - Angular FOV (Degrees) 6 - Eye Relief (mm) 17 - Exit Pupil (mm) 4.2 - Close Focus Distance (ft) 9.3 - Interpupillary Distance Max (mm) 74 -Interpupillary Distance Min (mm) 56