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Explore Scientific 33x120mm BT-120 SF Large Binoculars w/ 62 Degree LER Eyepieces

SKU 01-14230
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Original price $2,349.99 - Original price $2,349.99
Original price
$2,349.99 - $2,349.99
Current price $2,349.99
Out of stock

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Explore Scientific BT-120 SF Large Binoculars with 62 Degree 20mm LER Eyepieces - 01-14230

Presenting the Explore Scientific 33x120mm BT-120 SF Large Binoculars with 62 Degree LER Eyepieces. These are oversized binoculars designed for celestial and terrestrial observations.

They provide a spectacular view of the night sky, revealing celestial objects like star clusters, nebulae, the moon, and planets in breathtaking detail.

During daylight hours, they also offer the capability to observe distant natural and man-made landscapes, including ships and airplanes.

The BT series binoculars are known for their versatile performance, made possible by their large, light-gathering lenses and professional lens coatings that deliver brilliant and vivid images even in low light conditions.

These oversized binoculars, with a 120mm objective diameter and 560mm focal length, provide a powerful 33x magnification, making them ideal for celestial and terrestrial observations.

They offer a wide 62-degree apparent field of view for panoramic vistas and comfortable, fatigue-free viewing, even when tilted.

The binoculars come with two Explore Scientific 62-degree 20mm Long Eye Relief (LER) eyepieces, renowned for their quality in the astronomy community.

These eyepieces offer a comfortable 15mm eye relief and soft silicone eyecups for relaxed and immersive viewing.

Built for outdoor use, these binoculars feature a sturdy magnesium housing that's both lightweight and robust.

They are sealed and nitrogen-filled to prevent internal optics from fogging, ensuring clear views even in challenging weather conditions.

Customize your viewing experience by selecting from a range of compatible eyepieces to adjust magnification and field of view to your preferences.

Improve contrast and visibility by attaching color and nebula filters directly to the eyepiece sleeves. These filters should be used in pairs for best results.

The binoculars offer a comfortable 45-degree viewing angle and helical individual focusing for effortless and precise adjustment.

The interpupillary distance can be adjusted between 54mm to 76mm to suit individual preferences.

A metal carrying handle at the center of gravity simplifies transportation and provides a secure grip during tripod setup.

For stable and shake-free observations, it's recommended to use these binoculars with a sturdy photo tripod.

They can be attached using two 1/4-inch or one 3/8-inch threaded holes in the tripod adapter of the binoculars.

The Explore Scientific U-Mount with field tripod is specifically designed for these large binoculars, offering an excellent mechanism with adjustable friction in both axes for easy tracking and vibration reduction even at high magnification.



  • 33x Magnification: These binoculars offer an impressive 33x magnification, allowing you to observe subjects in exquisite detail. Whether for in-depth astronomical exploration or terrestrial observation, this magnification range caters to a broad spectrum of enthusiasts.
  • 120mm Objective Lens: Equipped with a generous 120mm objective lens, these binoculars excel at capturing abundant light, resulting in crystal-clear and detailed observations. The larger objective lens diameter enhances their performance in low-light conditions and for celestial objects.
  • Large and Sturdy Design: With a robust build featuring a 120mm objective diameter and a 660mm focal length, these binoculars are well-suited for diverse observations. Their substantial size ensures stability and delivers impressive image quality, immersing you in your viewing experience.
  • Versatile Observation: These binoculars open up a world of possibilities, from exploring the moon, planets, and bright deep-sky objects in the night sky to observing terrestrial subjects during the day. Their versatility enables seamless transitions between celestial and terrestrial views without requiring additional equipment.
  • Rugged Construction: Crafted for durability, these binoculars are sealed and nitrogen-filled, effectively preventing fogging and making them suitable for various weather conditions and outdoor adventures. Their tough construction can withstand challenging climates.
  • Comfortable 45-Degree Viewing: The 45-degree viewing angle ensures ergonomic and fatigue-free use during extended observation sessions. Individual focusing allows for precise adjustments, facilitating relaxed stargazing or wildlife observation.
  • Integrated Carrying Handle: For added convenience during transportation and secure attachment to a tripod, these binoculars feature an integrated carrying handle. This handle enhances ease of use for on-the-go astronomers and nature enthusiasts.
  • Premium Eyepieces: Included are two premium waterproof Explore Scientific 62-degree 20mm Long Eye Relief (LER) eyepieces, delivering top-notch optics for your observations. These eyepieces offer a wide field of view and comfortable eye relief, enhancing your overall viewing experience.
  • Interchangeable Eyepieces: The 1.25-inch / 31.7mm eyepiece holder allows for the use of interchangeable eyepieces, offering flexibility in adjusting magnification and field of view to suit your preferences. This feature enables you to customize your observations to specific objects or scenarios.
  • Extendable Dew Caps: Featuring extendable dew caps, these binoculars effectively minimize condensation on the lenses, ensuring clear views even in changing environmental conditions. These caps are particularly valuable for preventing moisture buildup in humid or dew-prone locations.
  • Tripod Compatibility: With compatibility for tripods via two 1/4-inch and one 3/8-inch photo thread connections, these binoculars provide stability for your observations while minimizing vibrations. Tripod use is crucial for achieving steady and shake-free views, especially during high-magnification observations.
  • Accessory Bundle: This comprehensive package enhances your observing experience with essential items, including a built-in carrying handle for convenient transport, protective lens caps for safeguarding optics, premium eyepieces for top-notch viewing quality, extendable dew caps to prevent condensation, and a limited 1-year warranty for enduring assurance.


Recommended Accessories:

To enhance your viewing experience, we strongly recommend using a sturdy tripod with the required load capacity.

These binoculars can be securely attached using either two standard 1/4-inch threads or one 3/8-inch threaded hole, compatible with most tripods.

For even greater stability and support, consider the optional Explore Scientific U-Mount with Tripod for BT-120 Large Binoculars, purpose-built for ES BT Series Binoculars.

Explore Scientific U-Mount with Tripod for BT-70 Large Binoculars

The Explore Scientific U-Mount is equipped with an adjustable friction mechanism that guarantees smooth movements and stable positioning, even when observing at high magnifications.

This feature enables you to examine the finest details with utmost precision, without any interference from disruptive vibrations.


What's Included:

✓ Explore Scientific 33x120mm BT-120 SF Large Binoculars

✓ Carrying handle

✓ Lens caps

✓ 2x Explore Scientific 62 Degree 20mm LER eyepieces

✓ Extendable dew caps

✓ Limited 1 year warranty


Item Number  01-14230
Optical design  Achromatic refractor Porro
Mirror / lens diameter  120 mm
Focal length  660 mm
Focal ratio  5.5
Apparent Facial field  62 degrees
Type of remuneration  Enhanced Multilayer Desposition (EMD)
Exit pupil min.  3.6 mm
Field of view  1.8 degrees
Waterproof  Yes
Water resistance protection level  IPX6
Exit pupil distance  15 mm
Total length  654 mm
Total width  290 mm
Total height  156 mm
Total net weight  8300 g
Housing material  Magnesium



Explore Scientific BT-120 SF Large Binoculars Product Manual:

Customer Reviews

Based on 1 review

I bought these binoculars in order to view Space X launches here in Florida, from the comfort of my condo balcony. I underestimated the stability of my tripod and had to upgrade to a sturdier model, all good now!