Explore Scientific

BT-82 SF Large Binoculars with 62 Degree LER Eyepieces

Regular price $1,799.99 USD
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BT-82 SF Large Binoculars with 62 Degree LER Eyepieces
$1,799.99 USD
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BT-82 SF Large Binoculars with 62 Degree LER Eyepieces


Description

The Explore Scientific BT-82 SF is a premium giant binocular built for serious astronomers and dedicated nature observers who demand the best in optical performance. Featuring 82mm objective lenses and a 480mm focal length, the BT-82 delivers bright, high-contrast views of celestial objects, distant landscapes, and wildlife with stunning clarity. Each eye is served by its own complete optical system, dramatically reducing eye fatigue during long observing sessions and creating a deeply immersive viewing experience.

Included 62° 20mm LER eyepieces produce 24x magnification and a 2.6° field of view, while compatibility with all standard 1.25" eyepieces lets you dial in magnification anywhere from 18x to 60x. The rugged magnesium housing is IPX6 waterproof and nitrogen-purged to prevent internal fogging, so you can count on the BT-82 whether you're stargazing in the backyard or observing in demanding field conditions. A 45° viewing angle, extendable dew caps, fine helical focus, and an integrated carrying handle complete a package that balances power, comfort, and portability.


Key Features

  • 82mm Objective Lenses: Large aperture gathers abundant light for bright, detailed views of planets, deep-sky objects, the moon, and terrestrial targets.
  • 480mm Focal Length / f/5.7: Achromatic refractor Porro optical design produces sharp, high-contrast images across a wide field.
  • Included 62° 20mm LER Eyepieces: Two long eye relief eyepieces deliver 24x magnification and a generous 2.6° true field of view right out of the box.
  • Interchangeable 1.25" Eyepiece Compatibility: Accepts any standard 1.25" / 31.7mm eyepiece, allowing magnification from 18x to 60x and optional filters for contrast enhancement.
  • IPX6 Waterproof & Nitrogen-Purged: Sealed magnesium housing resists water ingress and internal fogging for reliable all-weather performance.
  • 45° Viewing Angle: Angled eyepiece configuration allows comfortable, relaxed viewing during extended astronomy or nature observation sessions.
  • Extendable Dew Caps: Help shield objective lenses from dew and stray light, maintaining optical clarity in humid or nighttime conditions.
  • Fine Helical Focus: Smooth, precise focusing mechanism allows easy, accurate adjustments for both near and distant targets.
  • Magnesium Housing: Lightweight yet extremely durable construction designed for rugged outdoor and field use.
  • Integrated Carrying Handle & Tripod Mount: Facilitates easy transport and secure mounting on a photo tripod or the optional Explore Scientific U-Mount with Field Tripod.

What's Included

  • BT-82 SF Giant Binoculars (82mm)
  • Two 62° 20mm LER Eyepieces

Why You'll Love It

The BT-82 SF is the kind of instrument that transforms a casual interest in astronomy or nature watching into a genuine passion - its immersive, wide-field views of star clusters, nebulae, and moonscapes are unlike anything a standard binocular or small telescope can offer. Backed by Explore Scientific's reputation for premium optics and rugged construction, this is a binocular built to deliver night after night of dependable, high-performance observation. The magnesium chassis and IPX6 waterproofing mean it's equally at home on a dewy observing field or a windswept hillside during a wildlife watch. Eyepiece interchangeability gives you lasting flexibility as your interests grow, and the 45° viewing angle makes those long sessions genuinely comfortable rather than a test of endurance. Whether you're a dedicated amateur astronomer, a birding enthusiast, or a nature observer seeking a serious upgrade, the BT-82 SF delivers clarity, comfort, and versatility that will keep you coming back to it for years to come.


Product Specifications

View Product Specs
Item Number 01-14210
Optical Design Achromatic Refractor Porro
Objective Lens Diameter 82 mm
Focal Length 470 mm
Focal Ratio f/5.7
Apparent Field of View 62 degrees
True Field of View 2.6 degrees
Magnification (Included Eyepieces) 24x
Eyepiece Compatibility 1.25" / 31.7mm standard eyepieces; 18x to 60x range
Coating Type Enhanced Multilayer Deposition (EMD)
Exit Pupil (Min) 3.5 mm
Eye Relief 15 mm
Waterproof Rating IPX6
Viewing Angle 45 degrees
Total Length 445 mm
Total Width 226 mm
Total Height 122 mm
Net Weight 4300 g
Housing Material Magnesium

FAQ

Do I need a tripod to use the BT-82 SF?

Yes - at 4,300g and 24x magnification, the BT-82 SF requires a sturdy tripod for comfortable, shake-free viewing. The binocular features an integrated carrying handle with a standard tripod mounting point, making it compatible with most heavy-duty photo tripods. For the best experience, Explore Scientific also offers the optional U-Mount with Field Tripod, which is specifically designed for use with their large binocular lineup.

Can I use my own eyepieces with the BT-82 SF?

Absolutely. The BT-82 SF accepts any standard 1.25" (31.7mm) eyepieces, giving you the flexibility to adjust magnification from approximately 18x up to 60x depending on the eyepiece focal length you choose. You can also use 1.25" filters for enhanced contrast when viewing the moon, planets, or nebulae.

Is the BT-82 SF suitable for daytime terrestrial use, or is it primarily for astronomy?

The BT-82 SF excels at both. Its 82mm objective lenses and wide 2.6° field of view make it excellent for nature observation, birding, wildlife watching, and scenic viewing during the day, as well as for astronomy at night. The 45° viewing angle is especially comfortable for scanning landscapes or tracking birds over extended periods.

What does "nitrogen-purged" mean, and why does it matter?

Nitrogen purging means the internal air inside the binocular has been replaced with dry nitrogen gas before sealing. Because nitrogen contains no moisture, it eliminates the risk of internal fogging when the binocular moves between warm and cold environments. Combined with the IPX6 waterproof rating, this makes the BT-82 SF a reliable instrument in humid, cold, or rainy conditions.

What is the warranty on the Explore Scientific BT-82 SF?

The BT-82 SF comes with an Explore Scientific limited warranty. To activate full coverage, Explore Scientific recommends registering your product within 60 days of purchase. Please refer to Explore Scientific's official warranty policy for complete terms and conditions.

Product specifications table
Specification name Specification Value
Color pattern Silver
Material Metal

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