Leupold sweats the details when it comes to their products. The BX-1 McKenzie is proof sweat is worth it. You'll be able to see more details with these than with other comparable models. The BAK4 roof prism design gives you better resolution than others in its class. The compact design allows it to feel good in your hands no matter how long your trip is. Leupold binoculars won't be outlasted or outperformed. Each binocular has been tested to ensure durability even in the harshest conditions. Leupold BX-1 McKenzie Features 100% Waterproof and Fog Proof Absolute waterproof and fog proof integrity - each is ready for a lifetime in the field, in all conditions. BAK 4 Prisms Delivers a perfectly round exit pupil with virtually no edge distortion and a crisp, clear image. Central Focus Dial Large, tactile focus dial is easy to find and use, even with gloved hands, which gives you the precision focus you need to pick antlers out of the trees or hide out of the bush. Proprietary Nitrogen Fill Process Made with Leupold's proprietary nitrogen sealing process, which has become the industry standard. Rugged and absolutely waterproof. Ergonomic Design The binoculars are slim, lightweight, and fit well into your hands no matter what size they are. Specifications Weight: 22.3 ounces Length: 5.9 inches Eye Relief: 17mm Field of View: 320 feet @ 1000 yards Angular Field of View: 6.1Adeg Exit Pupil: 5.2mm Close Focus Range: 9.8 feet Interpupillary Distance: 74mm (max) 56mm (min Objective Diameter: 42mm Product Type: Binoculars Item Condition: New UPC: 030317029425 MPN: 181172