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Explore Scientific 15-50x70mm BT-70 SF Large Binoculars with 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 15-50x70mm BT-70 SF Large Binoculars with 62 Degree LER Eyepieces - 01-14200

Introducing the Explore Scientific 15-50x70mm 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.



  • 15-50x Magnification: This indicates the range of zoom levels these binoculars can achieve. At 15x magnification, objects will appear 15 times closer than they would to the naked eye. At 50x magnification, objects will appear 50 times closer.
  • 70mm Objective Diameter: These Binoculars feature a 70mm aperture, offering strong light-gathering capability.
  • 400mm Focal Length: The focal length (400mm) influences the magnification and field of view.
  • 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.
  • Includes Two Premium Waterproof Explore Scientific 62 Degree 20mm LER Eyepieces: This specifies that the binoculars come with two high-quality eyepieces with a wide apparent field of view (62 degrees) and a long eye relief (LER). They are also waterproof, ensuring durability in various conditions.
  • Eyepiece Holder 1.25 inch / 31.7mm, Interchangeable Eyepieces: This indicates the size of the eyepiece holder, allowing 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.

                                                                    What's Included:

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

                                                                    ✓ Carrying handle

                                                                    ✓ Lens caps

                                                                    ✓ 2 LER eyepieces

                                                                    ✓ Extendable dew caps

                                                                    ✓ Limited 1 year warranty


                                                                    • Enhanced Zoom Capability Observations: Whether you're focusing in at 15 times or a remarkable 50 times closer, these binoculars allow for meticulous exploration of distant subjects.
                                                                    • Optical Excellence: These crucial specifications underpin the binoculars' exceptional ability to capture light, ensuring clarity, and facilitating detailed magnification.
                                                                    • Versatile Observation Capability: From the moon and planets in the night sky to earthly landscapes, these binoculars thrive in diverse environments, offering a versatile observing experience.
                                                                    • Engineered for Outdoor Conditions with Fog-Proof Optics: These binoculars are crafted to endure harsh outdoor environments, delivering consistently clear views even when the weather turns challenging.
                                                                    • Ergonomic Comfort and Pinpoint Focusing for Detailed Views: Experience comfortable viewing angles and fine-tuned focus adjustments, making for extended observation sessions without discomfort.
                                                                    • Convenient Transport with Integrated Handle: The built-in handle at the center of gravity allows for easy transport and secure handling during tripod setup, enhancing the overall portability of the binoculars.
                                                                    • Premium Waterproof Eyepieces: These high-quality eyepieces, with their wide field of view and long eye relief, ensure an exceptional viewing experience in any weather condition. They're built to withstand the elements while providing consistently sharp images.
                                                                    • Customize Your View with Interchangeable Eyepieces: Tailor your observing experience by selecting compatible eyepieces, allowing you to fine-tune your observations to suit your preferences and targets.
                                                                    • Anti-Fog Protection with Extendable Dew Caps: Extendable dew caps are a practical feature designed to reduce condensation and maintain clear views during temperature fluctuations and periods of high humidity.
                                                                    • Sturdy Tripod Attachment for Stable, Detailed Observations: Easily attach the binoculars to various tripods, ensuring stability for capturing even the finest details without any disruptions. This feature is essential for high-quality observations.
                                                                    • Complete Package: Includes a convenient carrying handle, lens caps, two LER eyepieces, and extendable dew caps.


                                                                                                  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.



                                                                                                  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 15-50x70mm 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.