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BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

$1,599.99

Olivia's profile picture

- Olivia 

Zoom in like a pro: Get up close and personal with details using magnifications up to 50x (just swap the eyepieces for different views). See Saturn's rings like never before, spot tiny stars, and explore craters on the moon in detail..| Verified Purchase"

Main Benefits:

  • Aperture & Focal Length: 90mm objective lens with a focal length of 495mm, resulting in a fast f/5.5 focal ratio. This wide aperture allows for gathering more light and capturing fainter deep-sky objects, while the fast focal ratio is ideal for astrophotography, reducing exposure times.
  • Mount type: This telescope is not sold with a mount, so you will need to purchase one separately. It is compatible with a variety of equatorial mounts that can track the movement of the stars across the night sky.
  • Optics: The telescope features a 5-group, 5-element objective lens design with two SD (Super ED) lenses and one high-refractive index ED lens. This combination of lenses effectively corrects for chromatic aberration, both axially and laterally, ensuring sharp and color-accurate images across the entire field of view, even at the edges.

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Features

  • Powerful large binoculars with a 70 mm objective diameter and 400 mm focal length
  • Observe the moon, the planets and bright deep sky objects in the night sky as well as terrestrial targets
  • Extremely robust binoculars, sealed and filled with nitrogen
  • Convenient 45-degree view and individual focusing
  • Carrying handle makes it easier to transport the binocular and ensures a secure hold during tripod assembly
  • Includes two premium waterproof Explore Scientific 62 degree 20mm LER eyepieces
  • Eyepiece holder 1.25 inch / 31.7mm, interchangeable eyepieces
  • Extendable dew caps minimize condensation on the lenses
  • Tripod connection: 2 x 1/4 inch and 1 x 3/8 inch photo thread
  • Optional accessories: Item 01-14300 U-mount with field tripod

Description

Giant binocular for observing the starry sky, nature and landscape. 
Observe the beauty of the starry sky at night and distant objects in nature during the day. Globular star clusters, glowing gas nebulae, the moon with its craters and even planets can be observed wonderfully on a clear night. But also all other distant things in nature and landscape, even ships and airplanes can be seen in detail. With the all-round binoculars of the EXPLORE SCIENTIFIC BT series, you can get up very close. Thanks to the large, light-gathering lenses and the professional coatings on all lens surfaces, these binoculars produce bright and brilliant images even at night and at twilight, providing a special viewing pleasure. The comfortable 45 degree viewing angle allows fatigue-free use even when the binoculars are tilted strongly.  

A large binocular can also be called a double refractor telescope 
One complete lens telescope with the full light gathering power is available per eye. Experience a whole new dimension of observing. Objects are reproduced almost vividly in these binoculars and observing with both eyes is basically very relaxed. Last but not least, this comfortable way of observation increases the recognition of the finest details and effectively prevents rapid eye fatigue. 

Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen  
The BT series binoculars are designed for tough outdoor use. The IPX6 sealed and nitrogen-filled design effectively prevents fogging of the internal optics even under difficult weather conditions. The very light magnesium housing saves weight and makes it easy to handle. Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included. EXPLORE SCIENTIFIC is an established manufacturer of extremely high-quality eyepieces in the astronomy scene. An optical system is only as good as its weakest component. Therefore we have decided to deliver these giant binoculars with a pair of quality eyepieces of the 62 degree LER series. With an apparent field of view of 62 degrees and a focal length of 20mm, the BT-70 binoculars produce a 20x magnification. Thus these wide angle eyepieces offer a very good overview (field of view 3.1 degree) at moderate magnification. The large interpupillary distance of these LER (long eye relief) eyepieces of 15mm and soft silicone eyecups, which can be turned inside out, also guarantee a comfortable and relaxed view. For astronomy, a flat and sharp image field is advantageous and offers a particularly impressive viewing experience even during the day. Due to the waterproof design and the argon filling, these eyepieces are absolutely durable and easy to clean. 

Interchangeable eyepieces with 1.25 inch / 31.7mm plug-in diameter 
Adjust the magnification and field of view to your individual needs and choose from a wide range of available eyepieces. All eyepiece types with a plug-in diameter of 1.25 inch / 31.7mm can be used with the binoculars of the BT series. Especially recommended are EXPLORE SCIENTIFIC eyepieces of the 62 and 82 degree series with focal lengths from 8 to 26mm (see item No. 02188xx and 02196xx). The magnification can be varied from 15x to 50x (focal length binoculars : focal length eyepiece = magnification). The eyepieces are held in the binoculars by a precise brass compression ring clamp and guarantee a tilt free position.  

Use of color and nebula filters for astronomical observations 
Increase the contrast and visibility of objects and details by screwing the corresponding filters directly into the thread of the eyepiece sleeves. The use of color and nebula filters must of course always be done in pairs. Suitable are all EXPLORE SCIENTIFIC screw filters with 1.25inch / 31.7mm diameter (see item No. 03102xx)  

Comfortable 45 degree view and helical single focus 
The 45-degree viewing angle allows a relaxed observation position even when the binoculars are tilted strongly. Also the individual interpupillary distance can be adjusted in a range from 54 to 76mm. With the fine helical individual focusing, precise focusing is achieved effortlessly. Extendable dew caps The integrated dew caps can be removed in high humidity and cold conditions. This avoids fogging of the outer objective lenses and effectively shields additional control light coming in from the side. 

Integrated carrying handle 
A metal carrying handle located at the center of gravity facilitates transport and ensures a secure hold during tripod assembly. 

Suitable tripods and tripod connection
When using these large binoculars, a sturdy photo tripod with an appropriate load capacity is highly recommended. The connection is made via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread) in the tripod adapter of the binoculars. The ideal solution is to use the optional availlable EXPLORE SCIENTIFIC U-Mount with field tripod (item No. 01-14300). This is specially designed for the large binoculars of the BT series and carries these devices absolutely safely. The excellent mechanism with adjustable friction in both axes allows easy moving and tracking. The binocular position is kept stable depending on the adjusted friction intensity. Vibrations are reduced to a minimum by the massive construction of the U-Mount and the large stainless steel tripod. Even at high magnification there are no vibrations and the finest details can be observed.

Specification

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

Warranty

Explore Scientific Giant Binoculars come with a 1-year warranty when registered within 60 days of purchase.

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BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

Versatile Observational Experience

The powerful large binoculars with a 70 mm objective diameter and 400 mm focal length offer versatile observation capabilities, allowing you to observe celestial objects such as the moon, planets, and bright deep sky objects, as well as terrestrial targets.

With their 45-degree view and individual focusing, these binoculars provide comfortable and customizable viewing angles, reducing fatigue during extended observation sessions.

The inclusion of two premium waterproof Explore Scientific 62-degree 20mm LER eyepieces ensures high-quality viewing experiences with bright and brilliant images, enhancing your overall observational pleasure.

BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

Durable and Robust Design

The binoculars are extremely robust, sealed, and filled with nitrogen, making them suitable for tough outdoor use. The magnesium housing adds durability while keeping the binoculars lightweight and easy to handle.

Designed with an IPX6 waterproof rating and nitrogen filling, these binoculars prevent fogging of internal optics even in challenging weather conditions, ensuring clear views at all times.

The integrated dew caps and extendable design minimize condensation on the lenses and shield against additional control light, maintaining optimal viewing conditions.

BT-70 SF Large Binoculars with 62 Degree LER Eyepieces

Interchangeable Eyepieces and Expandability

The binoculars feature an eyepiece holder with a 1.25-inch / 31.7mm diameter, allowing for interchangeable eyepieces to adjust magnification and field of view according to individual preferences.

Users can choose from a wide range of available eyepieces, including EXPLORE SCIENTIFIC eyepieces of the 62 and 82-degree series, to further customize their viewing experience.

Additionally, the binoculars are compatible with color and nebula filters for astronomical observations, further enhancing contrast and visibility of objects and details.


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Aperture size is the diameter of the main lens or mirror in a telescope, and it is the most important factor in determining how much light the telescope can gather. More light means brighter and more detailed images. Generally, larger apertures are better, but they also tend to be more expensive and bulkier.

Magnification is important for making objects appear larger, but it does not create more detail. Aperture is more important for determining the overall quality of the image, including its brightness, resolution, and contrast. However, magnification can still be useful for getting a closer look at specific features of an object that you can already see with lower magnification.

All telescopes are affected by light pollution to some extent, but Dobsonians and reflectors are generally less affected than refractors. This is because refractors have more internal surfaces where light can bounce around and cause glare. If you live in an area with a lot of light pollution, you may want to consider a Dobsonian or reflector, or find a dark observing location.

The essential accessories for your telescope will depend on your specific needs and interests. However, some common recommendations include:
Extra eyepieces: This will allow you to change the magnification of your telescope to suit different observing conditions and objects.
A finder scope: This is a small, low-power telescope that helps you aim the main telescope at the correct area of the sky.
A collimation kit: This is used to adjust the alignment of the mirrors in a reflector telescope.
A star chart or planisphere: This will help you identify objects in the night sky.

Dobsonian telescopes are generally the easiest to set up, as they typically only require placing them on the ground and aligning the finder scope. Refractors and reflectors may require more assembly and alignment, but the process is not overly complicated. Many telescopes come with instructions and online resources can also be helpful.

You may need a few basic tools, such as a screwdriver or Allen wrench, to assemble some telescopes. However, you do not need any special knowledge to get started. There are many resources available to help you learn how to use your telescope, such as online tutorials, books, and astronomy clubs.

Here is a general guide to what you can expect to see under typical observing conditions with different telescope apertures:

50mm-70mm: You can see the phases of Venus, the moons of Jupiter, and some brighter deep sky objects like the Andromeda Galaxy and the Orion Nebula.
70mm-100mm: You can see more detail in the planets, including the rings of Saturn and the cloud bands on Jupiter. You can also see more faint deep sky objects.
100mm+: You can start to see more challenging deep sky objects, such as galaxies, nebulae, and star clusters. You can also see more detail in fainter objects like comets and asteroids.

We are often advised that you are able to see them through any small telescope, or even binoculars. But you really need a telescope with at least 40 times magnification to clearly see the detail of the rings as separate from the planet. And the bigger the telescope, the better.

For Galactic Observations: A reflecting telescope with a larger aperture (150mm-250mm) and a moderate focal length (750mm-1250mm) is ideal for capturing distant galaxies. Telescopes such as the Orion XT8 or the Celestron Advanced VX 8" offer excellent light-gathering capabilities and versatility.

Optical telescopes, for example, can see objects up to billions of light-years away, while radio telescopes can detect signals from even further distances. However, when it comes to observing the universe's earliest moments, telescopes can only see so far.

In general, a top-quality 4-inch refractor shows deep-sky objects about as well as a 5-inch reflector or catadioptric, and might even do a bit better on the planets. Most telescopes with apertures of 80 mm or less are refractors.

Refractor Telescopes: Refractors use lenses to gather and focus light, offering crisp and clear images. They are excellent for planetary observation due to their ability to provide high contrast and detailed views.

Some of the most newly detected objects may be over 13 billion light years away, as derived from a standard model of the Universe. However, a powerful new generation of telescopes, like the James Webb Space Telescope, will be needed to confirm the suspected distances of these objects.

The most important aspect of any telescope is its aperture, the diameter of its main optical component, which can be either a lens or a mirror. A scope's aperture determines both its light-gathering ability (how bright the image appears) and its resolving power (how sharp the image appears).

The telescope you want has two essentials: high-quality optics and a steady, smoothly working mount. And all other things being equal, big scopes show more and are easier to use than small ones, as we'll see below. But don't overlook portability and convenience — the best scope for you is the one you'll actually use.

With just a small or medium-sized telescope, skygazers can easily observe planets. You'll be surprised how much of our solar system you can see! And you don't need a dark sky to view all of our solar system's planets; even under city lights, Venus, Mars, Jupiter and Saturn can be easy to see with a telescope.

In summary: Refractors generally have the edge over reflectors for a quality image, both from the standpoint of lens/mirror quality and precision optical mountings, and lack of central obscurations.


Customer Reviews

Based on 5 reviews
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A
ANTONIO
I can see Saturn clearly

I love that thing

S
Sarah
Awesome telescope

This is a very clear telescope, i can definitely view the stars and moon more clearly. The controls take some time to get used to but it is not that hard.

J
Jim
Great telescope

Bought this for my grandson for Christmas and it was a hit. We did purchase the motor for stabilization and that is almost a necessity. It works great.

J
Joel
GREAT!

Great telescope and got it on a good deal.

J
Jennifer
Five Stars

Sweet telescope, user friendly, quick set up, LOTS of features for a fair price


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