Oberwerk BT-82XL-SD Binocular Telescope

Description

Engineered with 82mm FCD100 super-low dispersion apochromatic doublet objectives, the Oberwerk BT-82XL-SD Binocular Telescope delivers portable stereoscopic resolution for high-altitude astronomical viewing and long-distance border surveillance. Equipped with supplied 14mm 70-degree wide-field eyepieces that produce 32x magnification, this instrument provides a 115.5-foot field of view at 1000 yards (38.3m at 1000m), an actual angle of view of 2.2 degrees, a 2.6mm exit pupil, and 15mm of eye relief for resolving lunar topography, planetary disks, and distant marine traffic.

The optical assembly incorporates 82mm FCD100 super-low dispersion (SD) doublet lenses paired with oversized clear-aperture BaK-4 Porro prisms and broadband fully multi-coated optical surfaces for faithful color correction and photon throughput. Measuring 41.9cm (16.5 inches) in length and weighing 4.7 kg (10.3 lbs), the chassis is cast from lightweight magnesium alloy finished in durable Luna Pearl protective enamel. The optical housing is O-ring sealed and nitrogen gas purged for complete waterproof and fogproof protection in damp night environments. Eyepiece receptacles are inclined at a 45-degree angle to provide comfortable viewing when observing zenith sky regions, controlled by individual helical focusers that accept standard 1.25-inch telescope eyepieces, an interpupillary distance adjustment scale from 50mm to 80mm, retractable aluminum dew shields, a built-in Picatinny top rail handle, and a Vixen-style dovetail mounting foot with 1/4-20 and 3/8-16 threaded tripod sockets.

Key Features of Oberwerk BT-82XL-SD Binocular Telescope

Positioned as an agile large-aperture observation instrument, this 82mm binocular telescope unites FCD100 apochromatic optics with a lightweight magnesium frame. Its broadband multi-coated doublet lenses and BaK-4 Porro prisms deliver crisp, color-pure imagery across lunar surfaces and deep-sky star fields. The nitrogen-purged waterproof chassis mounts onto video fluid heads and alt-azimuth fork mounts via its dual-threaded dovetail foot for stable field tracking.

• 32x standard magnification with supplied 14mm eyepieces and high-gathering 82mm objective apertures
• Porro prism optical architecture incorporating oversized clear-aperture BaK-4 optical prisms
• Apochromatic doublet objective lenses incorporating Japanese FCD100 super-low dispersion glass
• Linear field of view of 115.5 feet at 1000 yards (38.3m at 1000m) across a 2.2-degree actual angle of view
• Comfortable 15mm eye relief with soft fold-down rubber eyecups on interchangeable 1.25-inch oculars
• Independent helical focusing collars accommodating standard 1.25-inch astronomical filters and eyepieces
• Nitrogen gas filled magnesium alloy chassis providing complete waterproof and fogproof protection
• Integrated Vixen-style dovetail foot featuring 1/4-20 and 3/8-16 threaded tripod mounting sockets

FCD100 SD Doublet Glass & Oversized BaK-4 Porro Prisms

The 82mm FCD100 super-low dispersion doublet objective lenses suppress secondary spectrum chromatic aberrations, presenting bright celestial objects and mountain horizons with authentic color purity and sharp edge definition. Oversized BaK-4 Porro prisms provide complete optical throughput across standard 1.25-inch ocular barrels, preventing internal optical vignetting and peripheral dimming. Broadband multi-coatings maximize photon transmission across the visible spectrum, revealing subtle details in planetary nebulae and splitting tight double star systems.

Magnesium Chassis Engineering & 45-Degree Viewing Ergonomics

Weighing only 4.7 kg, the magnesium alloy body provides structural rigidity to maintain optical collimation alignment while remaining easily portable for dark-sky field expeditions. The 45-degree angled ocular orientation permits comfortable viewing of high-elevation celestial targets without neck strain. Retractable aluminum dew shields slide outward to block stray peripheral light and prevent dew formation on the objective glass, while dual independent helical focusers allow precise focal tuning for each eye.

• Independent helical focus collars delivering micro-fine focus adjustment for individual eye correction
• Nitrogen gas purged magnesium alloy housing resistant to outdoor dew, moisture, and temperature drops
• Built-in 45-degree angled eyepiece ports and Picatinny top rail handle for mounting optical finders

Oberwerk 5-Year Limited Warranty & In-Box Inclusions

The Oberwerk BT-82XL-SD Binocular Telescope is protected by the Oberwerk 5-year limited manufacturer warranty against defects in materials, construction, and optical collimation. The complete factory package contains the Oberwerk BT-82XL-SD binocular telescope optical tube assembly, pair of Oberwerk 14mm 70-degree eyepieces (32x), extendable dew shields, objective covers, eyepiece caps, and wheeled aluminum-frame hard transport case.