BT-82 SF Large Binoculars with 62 Degree LER Eyepieces
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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.
Thank you for trusting us with your order! This product is shipped directly from the manufacturing warehouse to get to customers all over the U.S. as soon as possible!
While many of our products are prepared and shipped out within 48 hours, some of our items are built to order or require custom pieces that could take 2-6 weeks to prepare before shipping! Please contact us at 888-884-2234 for a delivery ETA if you have a strict timeline.
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Omaha Sports & Games Team
Returns & Refunds Policy
Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at service@omahasportsandgames.com.
If your return request is accepted, it will be up to you as the buyer to return the item in its original packaging, unworn and unused. You as the buyer will be responsible for paying the return shipping. We may be able to assist you in scheduling a pickup for return but the payment will still be your responsibility. You can always contact us for any return question at service@omahasportsandgames.com.
All products are subject to a minimum 15% restocking fee based on the quality of the returned product and packaging.
Items opened, tested, used, or any other non-new condition may be eligible for return based on the manufacturer's return policy.
Shipping Damages and Issues
You must inspect your order upon reception and refuse delivery if you see damage. DO NOT sign for delivery if there is apparent damage to the product. If you sign for the delivery and later claim shipping damage, there is very little we can do to help.
If your order does not require signing at delivery and is instead just dropped off at doorstep with damage, contact us immediately with photos of the damaged boxes.
If your item(s) is defective, damaged or if you receive the wrong item, contact us immediately so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, such as custom products, special orders or personalized items. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items, gift cards, or multiple product bundle discounts.
| Specification name | Specification Value |
|---|---|
| Color pattern | Silver |
| Material | Metal |