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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces
Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

Explore Scientific BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

by Explore Scientific
SKU ES-01-14200
$1,699.99 - $1,699.99
$1,699.99
$1,699.99 - $1,699.99
$1,699.99
Price Match Policy!
  • Large Aperture Objective Lenses
  • Interchangeable 1.25" Eyepiece Compatibility
  • Comfortable 45-Degree Angled Viewing
  • Waterproof and Nitrogen-Purged Magnesium Housing
  • Individual Helical Focusers
  • Extendable Dew Shields
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  • Description
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  • BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

    The Explore Scientific BT-70 SF Large Binoculars deliver an immersive, three-dimensional viewing experience for both astronomy and terrestrial observation. By dedicating a complete optical system to each eye, these binoculars produce bright, high-contrast images and eliminate the fatigue associated with single-eyepiece viewing. Their large objective lenses gather substantial light, revealing faint celestial objects in the night sky and rendering distant landscapes with exceptional clarity.

    Immersive, Fatigue-Free Views with Dual Optical Paths

    Unlike a conventional telescope, the BT-70 SF uses two independent optical paths to create a true binocular view. This approach provides a remarkable sense of depth and realism, whether you are scanning the star fields of the Milky Way or observing distant wildlife. This design significantly reduces eye strain during long observing sessions, allowing you to focus on the view in comfort.

    Adaptable Optics: Swap Eyepieces and Filters

    A key feature of the BT-70 SF is its ability to accept standard 1.25" astronomical eyepieces. This allows you to change magnification by simply swapping eyepiece pairs, tailoring the instrument's power to your target. You can go from a wide-field, low-power view for sweeping star clusters to high-power for resolving details on the Moon. The standard filter threads on the eyepieces also permit the use of color or nebula filters to enhance contrast on specific objects.

    Designed for Comfort: Angled Viewing and Helical Focus

    The eyepieces are set at a comfortable 45° angle, which is essential for astronomical viewing. This orientation prevents neck strain when observing objects high overhead. Each eyepiece has its own fine helical focuser for precise, independent adjustment, ensuring a perfectly sharp image for your eyes. The binoculars also feature an integrated carrying handle for secure transport and extendable dew caps to block stray light and reduce moisture buildup on the lenses.

    All-Weather Reliability: Nitrogen-Purged and Waterproof Housing

    Built for the rigors of outdoor use, the BT-70 SF features a lightweight yet robust magnesium housing. The optical tubes are sealed and purged with inert nitrogen gas, which prevents internal fogging of the lenses during temperature changes or in humid conditions. This IPX6-rated waterproof construction ensures that your investment is protected from dew, frost, and unexpected rain, making them a reliable tool for any observing environment.

  • What makes the Explore Scientific BT-70 SF Large Binoculars good for astronomy?

    The BT-70 SF's large objective lenses gather significantly more light than standard binoculars, revealing fainter stars, nebulae, and galaxies. The comfortable 45° angled view is ideal for looking up at the night sky without neck strain, and the ability to use two eyes provides a more immersive, 3D-like experience while reducing eye fatigue during long sessions.

    Can I use the Explore Scientific BT-70 for daytime terrestrial viewing?

    Yes, absolutely. These binoculars are excellent for long-distance terrestrial observation, such as bird watching, viewing ships at sea, or taking in detailed landscapes. The high-contrast optics and true-to-life stereo view make them a powerful tool for any daytime observer.

    How does the interchangeable eyepiece system on the BT-70 SF work?

    The BT-70 SF is designed to accept pairs of standard 1.25" astronomical eyepieces. This allows you to vary the magnification for different targets. For example, you can use a pair of low-power, wide-field eyepieces for scanning the Milky Way, then switch to a high-power pair to get a closer look at Jupiter's moons. This versatility makes it far more flexible than fixed-magnification binoculars.

    What kind of tripod is recommended for the BT-70 SF Large Binoculars?

    Due to their size and weight, a sturdy tripod is essential for stable, shake-free viewing. A robust photo or video tripod with a high payload capacity is a minimum requirement. For the best experience, especially for astronomy, the optional Explore Scientific U-Mount with Field Tripod is recommended, as it is designed specifically to handle large binoculars like the BT-70.

    What is the main advantage of the BT-70 SF's dual optical systems?

    Using two eyes provides several key benefits: a more natural and comfortable viewing experience, reduced eye strain over long periods, and an enhanced perception of depth. This makes views feel more three-dimensional and immersive compared to looking through a single-eyepiece telescope.

    How do the BT-70 SF binoculars perform when viewing the Moon?

    They provide stunning views of the Moon. By using a pair of higher-magnification eyepieces, you can explore craters, mountains, and maria in sharp detail. The 3D-like effect from binocular viewing makes the lunar landscape appear to float in space. For even greater contrast, you can add a pair of neutral density or "moon" filters to the eyepieces to reduce glare.

  • GTIN 00811803033917
  • Explore Scientific Warranty