The 8x42 and 10x42 Monarch ATB both feature an advanced roof prism optical design. It incorporates Nikon's exclusive Eco-Glass (made without the use of arsenic or lead) for all lens and prism elements. Prisms feature phase-correction coatings and high reflection mirror coatings for superior sharpness and resolution, and all lenses and are fully coated with multiple layers of anti-reflective compounds for maximum light transmission. The result is much improved low-light brightness, edge-to-edge sharpness, and definition.
Nikon's Monarch ATB series available in eight and ten power models, both with 42mm objective lenses, allowing for a 5.3mm exit pupil in the 8x model and a 4.2mm exit pupil in the ten power model. Each model close focuses down to just eight feet. The ten power model has a field of view of 314' @ 1,000 yards and the eight power possesses a 330' field @1,000 yards.
Built with an extremely durable alloy body housing, the Monarch ATB is ruggedly constructed for true waterproof, fogproof and shockproof performance. The 8x42 Monarch ATB measures just 5.7"x5" long and weighs 21.3 ounces, while the 10x model is only 5.6"x5" and weighs 21.1 ounces.
Ergonomic styling, mated with a rubber armored exterior provides added shock resistance and a firm grip, wet or dry. Turn and slide rubber eyecups, complemented by long eye relief, allow the binoculars to be used as comfortably by eyeglass wearers as those with uncorrected vision. A large central focus wheel and adjustable diopter make focus easy to achieve and maintain, even while wearing gloves

Features:

100% Waterproof/Fogproof/Shockproof
Ultra-rugged, rubber-armored, roof-prism design
Extended eye relief and central focus for viewing convenience
Fully Multicoated lenses for bright, clear images
Precision aligned optics for extended viewing
100% Waterproof/Fogproof/Shockproof
Ultra-rugged, rubber-armored, roof-prism design
Extended eye relief and central focus for viewing convenience
Fully Multicoated lenses for bright, clear images
Precision aligned optics for extended viewing
Specifications:

Focusing System: CF
Magnification x: 8
Objective Diameter (mm): 42
Real Angular Field of View: 6.3
Apparent Angular Field of View: 50.4
FOV @ 1000 yds (ft): 330
Close Focus Distance (ft): 8.2
Exit Pupil (mm): 5.3
Relative Brightness: 28.1
Eye Relief (mm): 19.6
Size (L&W) inches: 5.7x5.0
Size (L&W) mm: 146x129
Weight oz./grams: 21.3/605