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Explore Scientific 20x70mm BT-70 SF Large Binoculars w/ 62 Degree LER Eyepieces

SKU 01-14200
Original price $0.00 - Original price $0.00
Original price $0.00
$1,599.99 - $1,599.99
Current price $1,599.99
In stock

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Explore Scientific BT-70 SF Large Binoculars with 62 Degree 20mm LER Eyepieces - 01-14200

Discover the Explore Scientific 20x70mm BT-70 SF Large Binoculars featuring 62 Degree LER Eyepieces.

These impressive binoculars offer a unique viewing experience, whether you're exploring the celestial wonders or observing nature's intricate details.

With their large, light-gathering lenses and expertly coated surfaces, these binoculars deliver vivid images even in low light, ensuring a captivating viewing pleasure.

The ergonomic 45-degree viewing angle ensures comfortable use, even when tilted.

These binoculars essentially function as double refractor telescopes, providing each eye with a full light-gathering power for an immersive observation.

The result is a lifelike reproduction of objects, promoting a relaxed viewing experience while enhancing fine detail recognition and preventing eye fatigue.

Built to endure outdoor adventures, the BT series binoculars boast a robust magnesium housing, sealed and nitrogen-filled to prevent internal fogging in challenging weather conditions.

They come equipped with two high-quality Explore Scientific 20mm eyepieces from the 62 degree LER series, renowned for their exceptional performance in the astronomy community.

These eyepieces offer a wide apparent field of view and a comfortable 15mm eye relief.

With waterproofing and argon filling, they are both durable and easy to maintain.

The binoculars also accommodate interchangeable eyepieces with a 1.25 inch / 31.7mm plug-in diameter, allowing you to tailor the magnification and field of view to your preferences.

For astronomical observations, the addition of color and nebula filters can enhance contrast and reveal hidden details.

These filters are compatible with all Explore Scientific screw filters with a 1.25 inch / 31.7mm diameter.

With a helical single focus mechanism, achieving precise focus is effortless.

The integrated dew caps are extendable, providing protection against fogging in humid or cold conditions.

Additionally, a central metal carrying handle facilitates easy transportation and ensures stability during tripod assembly.



  • 20x Magnification: Paired with the ES 62 Degree 20mm LER Eyepieces, these Binoculars offer an impressive 20x magnification, bringing you closer to your subject with remarkable detail. Ideal for both detailed astronomical observations and terrestrial viewing, they serve as a versatile optical tool for enthusiasts of all kinds.
  • 70mm Objective Diameter: These binoculars feature a substantial 70mm aperture, providing robust light-gathering capability to deliver clear and detailed observations, especially in low-light conditions.

  • 400mm Focal Length: With a focal length of 400mm, these binoculars strike a balance between magnification and field of view, offering versatile performance for a wide range of celestial and terrestrial observations.

    • Observation Capability: These binoculars are designed for observing various celestial objects like the moon, planets, and bright deep sky objects at night. Additionally, they can be used for observing terrestrial targets during the day.
    • Extremely Robust and Nitrogen-Sealed: This feature implies that the binoculars are built to withstand tough outdoor conditions. The nitrogen-sealed design prevents fogging of the internal optics, ensuring clear viewing even in challenging weather.
    • Convenient 45-Degree View and Individual Focusing: The 45-degree viewing angle offers a comfortable observation position, even when the binoculars are tilted. Individual focusing means each eyepiece can be adjusted independently for precise focus.
    • Carrying Handle: This feature provides a handle at the center of gravity, making it easier to transport the binoculars. It also ensures a secure hold during tripod assembly.
    • Premium Eyepieces: These Binoculars come with two high-quality Explore Scientific 62 Degree 20mm Eyepieces. They are also waterproof, ensuring durability in various conditions.
    • Interchangeable Eyepieces: Allows for the use of interchangeable eyepieces with a 1.25 inch / 31.7mm plug-in diameter. This allows users to customize their viewing experience.
    • Extendable Dew Caps: These are designed to minimize condensation on the lenses. They can be extended to provide additional protection against fogging, particularly in high humidity or cold conditions.
    • Tripod Connection: 2 x 1/4 inch and 1 x 3/8 inch Photo Thread: This specifies the types of threaded holes (photo threads) available for attaching the binoculars to a tripod. It provides flexibility for different tripod configurations.
    • Included Accessories: 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 maximize your viewing experience, we recommend using a sturdy Tripod with the appropriate load capacity.

    The binoculars can be securely attached via two 1/4 inch or one 3/8 inch threaded holes, standard for most tripods.

    For optimal support, consider the optional Explore Scientific U-Mount with Tripod for BT-70 Large Binoculars, specially designed for ES BT Series Binoculars.

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

    This Explore Scientific U-Mount's adjustable friction mechanism guarantees smooth movements and stable positioning, even at high magnification, enabling you to observe the finest details without any vibrations.


    What's Included:

    ✓ Explore Scientific 15-50x70mm BT-70 SF Large Binoculars

    ✓ Carrying handle

    ✓ Lens caps

    ✓ 2x Explore Scientific 62 Degree 20mm LER Eyepieces

    ✓ Extendable dew caps

    ✓ Limited 1 year warranty



    Item Number  01-14200
    Optical design  Achromatic refractor Porro
    Mirror / lens diameter  70 mm
    Focal length  400 mm
    Focal ratio  5.7
    Apparent Facial field  62 degrees
    Type of remuneration  Enhanced Multilayer Desposition (EMD)
    Exit pupil min.  3.5 mm
    Field of view  3.1 degrees
    Waterproof  Yes
    Water resistance protection level  IPX6
    Exit pupil distance  15 mm
    Total length  370 mm
    Total width  213 mm
    Total height  122 mm
    Total net weight  3400 g
    Housing material  Magnesium



    Explore Scientific BT-70 SF Large Binoculars Product Manual:

    Customer Reviews

    Based on 2 reviews
    Mount on a heavy duty tripod.

    Crystal clear and nice detailed views of the planets. The Moon is a site to behold. Enjoy!

    Insanely large, brilliant Binoculars!

    Bought these binocular mainly to use for Astronomy, they replaced my old hard to use Telescope. The images are excellent.