See the universe in stunning detail with the Explore Scientific BT-100 Giant Binoculars — a professional-grade optical instrument that delivers breathtaking views of the Moon, planets, star clusters, and distant terrestrial targets. With giant 100mm objective lenses and dual high-contrast refractors, this binocular system provides a stereoscopic experience unmatched by single-tube scopes.
Whether you're chasing celestial wonders or scanning coastlines, the wide field of view and ultra-comfortable eye relief create a relaxed, immersive viewing experience you’ll enjoy for hours. From casual backyard sessions to remote dark-sky expeditions, the BT-100 is built for observers who demand optical excellence, rugged reliability, and ergonomic design.
CA Residents: Prop 65 WARNING(S)
⭐ Features & Benefits
- 100mm Objective Lenses – Capture more light for vivid clarity at night, twilight, or daytime.
- True Refractor Binoculars – Each side functions as a full refractor telescope for stereoscopic depth and realism.
- 28x Magnification Included – Comes with two Explore Scientific 62° LER 20mm eyepieces for powerful, immersive views.
- Custom Magnification Range – Standard 1.25" eyepiece holders support 21x to 70x magnification with interchangeable eyepieces.
- 45° Angled Eyepieces – Designed for ergonomic comfort, even during long sessions or high-altitude tracking.
- Helical Individual Focusers – Achieve razor-sharp focus in each eye with fine precision.
- EMD Multi-Coatings – Maximize contrast, brightness, and color accuracy across all optical surfaces.
- Waterproof & Nitrogen-Purged – Rated IPX6 for fog-free performance in damp or cold conditions.
- Magnesium Housing – Lightweight yet tough — built for adventure, transport, and field durability.
- Extendable Dew Shields – Block stray light and prevent lens fogging for clean, consistent viewing.
- Tripod-Ready with Carry Handle – Easily mount, transport, and secure your binoculars on any stable platform.
- Lifetime Collimation Service – Eligible for Explore Scientific’s lifetime alignment guarantee (shipping not included).
🌌 Perfect For
- Amateur and advanced astronomers seeking deep-sky performance
- Lunar and planetary viewing with rich, crisp detail
- Long-range terrestrial observation (mountains, coastlines, wildlife)
- Astronomy clubs, educators, and public outreach programs
- Observers who want binocular comfort with telescope-grade optics
🎒 What’s Included
- Explore Scientific BT-100 Giant Binoculars
- Two Explore Scientific 62° LER 20mm eyepieces (28x magnification)
- 1.25" Eyepiece holders (pre-installed)
- Built-in carrying handle
- Tripod mounting threads
- Instruction manual & warranty information
Specs
| Item Number | 01-14220 |
|---|---|
| Optical Design | Achromatic Refractor (Porro) |
| Objective Lens Diameter | 100 mm |
| Focal Length | 550 mm |
| Focal Ratio | f/5.5 |
| Magnification (Included EPs) | 28x (with 20mm eyepieces) |
| Apparent Field of View | 62° |
| True Field of View | 2.3° |
| Exit Pupil | 3.6 mm |
| Eye Relief | 15 mm |
| Interpupillary Distance Range | 54 – 76 mm |
| Waterproof Rating | Yes / IPX6 |
| Fogproof | Nitrogen Purged |
| Coatings | Enhanced Multilayer Deposition |
| Housing Material | Magnesium |
| Eyepiece Holder Diameter | 1.25 inch / 31.7 mm |
| Tripod Threading | 2 × 1/4", 1 × 3/8" |
| Length | 520 mm |
| Width | 270 mm |
| Height | 155 mm |
| Weight | 6.8 kg |
| Included Eyepieces | 2 × 20mm 62° LER Waterproof EPs |
| Included Accessories | Built-in Carry Handle, Dew Caps |
Warranty
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Free Lifetime Collimation Service – Explore Scientific offers complimentary collimation for the life of the binoculars. Customers are responsible for shipping both ways.
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1-Year Limited Warranty – To activate, simply register your product within 60 days of purchase at explorescientific.com.