Oberwerk 20×65 Deluxe ED Binoculars

Description

Mounted on sturdy tripods across dark-sky astronomy fields and scenic mountain lookouts, the Oberwerk 20×65 Deluxe ED Binoculars deliver high-contrast stereoscopic resolving power and generous light collection for celestial stargazing and long-range terrestrial surveillance. Featuring 20x magnification paired with 65mm objective apertures (f/6.0 focal ratio), this Porro prism instrument provides a 198-foot linear field of view at 1000 yards (65.7m at 1000m), an actual angle of view of 3.2 degrees (wide apparent angle of 64 degrees), a 3.25mm exit pupil, and 12mm of usable eye relief for resolving lunar rilles, planetary disks, and distant landscape topography.

The optical system features two-element objective lenses incorporating extra-low dispersion (ED) optical glass, paired with high-density BaK-4 Porro prisms and broadband fully multi-coated surfaces on all air-to-glass boundaries. Measuring 38.1 by 21.6 by 8.9cm (15 x 8.5 x 3.5 Inches) and weighing 2.9 kg (6.4 lbs), the chassis is built from a heavy-duty aluminum alloy body encased in slip-resistant black rubber armoring. The optical barrels are nitrogen gas filled and O-ring sealed for all-weather waterproof and fogproof protection. Mechanical adjustments feature a central focus wheel with a 114.8-foot (35m) close focus distance, a right-eye diopter adjustment ring, fold-down rubber eyecups, an interpupillary distance range from 56mm to 74mm, and an integrated balance-adjustable central tripod mounting post with a standard 1/4-20 threaded socket.

Key Features of Oberwerk 20×65 Deluxe ED Binoculars

Built as an optical homage to classic high-resolution observational glass, this 20×65 Porro prism binocular combines twin f/6.0 ED objective lenses with wide-field modified-Erfle eyepieces. Its small 3.25mm exit pupil darkens background sky glow, enhancing visual contrast on faint star clusters and planetary details. The nitrogen-purged waterproof chassis, balance-adjustable tripod post, and locking aluminum hard case ensure rigid collimation and safe transit across field sites.

• 20x magnification power combined with 65mm objective apertures for deep-sky resolving reach
• Porro prism optical architecture incorporating high-density BaK-4 glass for enhanced depth perception
• Two-element objective design incorporating extra-low dispersion (ED) optical glass
• Wide 64-degree apparent field of view with an actual angular field of 3.2 degrees at 20x
• Antireflection broadband multi-coating on all air-to-glass surfaces for optimal light transmission
• Central focus wheel with a right-eye diopter adjustment ring for individual eye focal balance
• Nitrogen-purged aluminum alloy chassis providing complete waterproof and fogproof protection
• Integrated balance-adjustable tripod mounting post with standard 1/4-20 threaded socket

Extra-Low Dispersion Doublet Lenses & BaK-4 Porro Prisms

The 65mm f/6.0 objective lenses utilize extra-low dispersion ED glass elements to suppress secondary spectrum chromatic aberration, ensuring the bright lunar limb, Jupiter satellites, and terrestrial horizons appear with clean color purity and sharp contrast. High-density BaK-4 Porro prisms provide total internal reflection, preventing internal light fall-off and preserving edge sharpness across approximately 90% of the wide 64-degree apparent field. Broadband multi-coatings across all optical faces minimize reflections, allowing observers to distinguish fine structural details across dark sky backgrounds.

Long-Tube Aluminum Housing & Balance-Adjustable Tripod Post

The 15-inch aluminum alloy optical tubes provide structural rigidity to maintain factory collimation under field transit while keeping total weight to 2.9 kg. Slip-resistant black rubber armoring cushions against physical knocks and provides a secure hold during setup. The integrated central tripod mounting post slides along the structural axis, allowing observers to achieve perfect center-of-gravity balance on fluid heads or heavy-duty parallelogram mounts, while the central focusing wheel provides smooth focal control out to optical infinity.

• Central focus wheel and right-eye diopter adjustment delivering precise focal tuning to infinity
• Submersible nitrogen-purged aluminum alloy chassis resistant to heavy dew and rain condensation
• Built-in balance-adjustable tripod mounting post enabling vibration-free attachment to tripods

Oberwerk 5-Year Limited Manufacturer Warranty & Hard Case

The Oberwerk 20×65 Deluxe ED Binoculars are backed by the Oberwerk 5-Year Limited Manufacturer Warranty, protecting the original purchaser against performance-compromising defects in materials and workmanship. The complete factory package contains the Oberwerk 20×65 Deluxe ED binocular, heavy-duty aluminum-frame locking hard case, integrated balance-adjustable tripod mount, objective lens covers, eyepiece protective caps, and microfiber cleaning cloth.