Vortex Optics Viper HD Roof Prism Binoculars 8x42

From the Amazon Listing

• 8x magnification and 42mm objective lenses, the 2018 Viper HD is a high-end, full-size yet compact binocular that is suited for any hunt. An easy-to-grip, rubber armored chasis with perfectly placed thumb indents provides superior ergonomics.
• A high density optical system delivers exeptional resolution and edge to edge clarity. XR anti-relfective lens coatings give bright, full views even in low light situations.
• A locking, right-eye diopter tailors each barrels' focus to your eyes. The smooth, center focus wheel provides fine focus control and quick sharp views. Twist-up eyecups rest comfortably against the face and provide customized eye relief.
• Argon purging and o-ring seals provide a lifetime of waterproof and fogproof performance. Ultra-hard, scratch resistant armortek protects the exterior lenses from scratches, oil, and dirt.
• In the field, you should have no trouble reaching them at a moment’s notice with the included GlassPak Chest Harness providing comfortable, protected, strain-free, all-day carry.Field of View:409 feet @ 1000 yd / 135.8 m @ 1000 m