Eschenbach Optik 10×42 Adventure D-Series B Active Binoculars

Description

Observe fine plumage gradations and inspect distant geological formations through the Eschenbach Optik 10×42 Adventure D-Series B Active Binoculars closed-bridge roof prism optical system [cite: 1.2.1]. Combining a 10x magnification with 42mm objective lenses, this outdoor observation binocular produces a 5.9-degree actual angle of view, a 309.7-foot linear field of view at 1000 yards (103.2m at 1000m), a 4.2mm exit pupil, and 13mm of eye relief, optimized for active hiking, wildlife stalking, and general outdoor exploration [cite: 1.2.7].

The optical system features premium BaK-4 roof prisms paired with fully multi-coated (FMC) optical glass lenses that minimize light reflection and enhance image brightness. Encased in a rugged closed-bridge housing with shock-absorbing textured rubber armoring, the instrument measures 5.8 by 5.3 by 2 inches (148 x 134 x 52mm) and weighs 26.56 oz (753g). Nitrogen filling and watertight internal seals protect optical elements against internal fogging and heavy moisture, while the large center focus wheel drives focal adjustment down to an 8.2-foot (2.5m) close focus distance, supported by a right-eye diopter adjustment ring [cite: 2.2.1], twist-up eyecups [cite: 1.2.1], a 56mm to 74mm interpupillary distance range, and standard 1/4-20 tripod threading [cite: 2.2.4].

Key Features of Eschenbach Optik 10×42 Adventure D-Series B Active Binoculars

Engineered for active outdoor adventurers and nature observers, this 10×42 optic pairs BaK-4 roof prisms with fully multi-coated glass elements. Its watertight nitrogen-purged chassis repels inclement weather, while the textured rubber armoring with gripping ridges ensures balanced, fatigue-free handling on rugged trails.

• 10x magnification power combined with 42mm objective lenses producing a 4.2mm exit pupil
• High-density BaK-4 roof prisms providing sharp edge definition and accurate optical geometry [cite: 1.2.1]
• Fully multi-coated optical glass elements maximizing light transmission and color contrast
• Linear field of view of 309.7 feet at 1000 yards (103.2 m at 1000 m) with a 5.9-degree angle [cite: 1.2.7]
• 13mm eye relief featuring twist-up rubber eyecups designed for spectacle and sunglass wearers [cite: 2.2.1]
• Minimum close focus distance of 8.2 feet (2.5 m) for observing nearby trailside wildlife and plants [cite: 1.2.7]
• Nitrogen-purged watertight housing encased in durable shock-absorbing rubber armoring
• Closed-bridge chassis with integrated 1/4-20 tripod threading, carry bag, strap, and lens caps included

BaK-4 Roof Prisms & Fully Multi-Coated Optical Train

The BaK-4 roof prisms provide high circular exit pupils with minimal vignetting, while broadband multi-coatings on all glass surfaces suppress internal reflections. This optical configuration maintains authentic color rendition, contrast, and image clarity across the 309.7-foot field of view, allowing observers to resolve fine feather details and subtle movement in wooded clearings and shaded canyons [cite: 1.2.7].

Closed-Bridge Chassis & All-Weather Nitrogen Sealing

The closed-bridge frame provides torsional stability across the twin optical barrels, while ergonomic gripping ridges on the bridge and sides provide a secure handhold during wet outings. Nitrogen gas purging prevents internal lens fogging during rapid elevation and temperature shifts, and the ribbed center focus wheel rotates smoothly for precise focal control from 8.2 feet out to infinity.

• Large central focus wheel with gripping ridges and a smooth right-eye diopter adjuster
• Nitrogen gas filled watertight chassis engineered to resist rain, humidity, and accidental knocks
• Twist-up rubber eyecups providing positive positioning for spectacle and sunglass wearers [cite: 2.2.1]

Eschenbach 5-Year Manufacturer Warranty Coverage

Eschenbach Optik backs the 10×42 Adventure D-Series B Active Binoculars with a 5-year limited manufacturer warranty covering defects in materials and optical craftsmanship [cite: 2.2.1]. The complete factory package contains Eschenbach Optik 10×42 Adventure D-Series B Active Binoculars, padded carrying bag, neck strap, two objective lens caps, ocular rainguard, and a lens cleaning cloth [cite: 2.2.1].