Giant binoculars Explore Scientific BT-70 SF with 20mm eyepieces 62º LER

Giant binoculars Explore Scientific BT-70 SF with 20mm eyepieces 62º LER

Giant binoculars for starry sky, nature and landscape observation.
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 the planets can be observed beautifully on a clear night. But you can also see in detail all other distant things in nature and the landscape, even ships and airplanes. With the all-round binoculars of the EXPLORE SCIENTIFIC BT series, you can get very close. Thanks to large, light-catching lenses and professional coatings on all lens surfaces, these binoculars produce clear, bright images even at night and dusk, providing special viewing pleasure. The comfortable 45-degree viewing angle allows fatigue-free use even when the binoculars are strongly tilted.

A large binocular can also be called a double refractor telescope.
A full-lens telescope with maximum light gathering power is available per eye. Experience a new dimension of observation. 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 fine details and effectively prevents rapid eye fatigue.

Extremely rugged binoculars with magnesium housing, sealed and nitrogen-filled
The BT series binoculars are designed for rugged outdoor use. The IPX6 sealed and nitrogen-filled design effectively prevents fogging of the internal optics, even in adverse weather conditions. The very light magnesium housing saves weight and facilitates handling. Two 20 mm EXPLORE SCIENTIFIC eyepieces of the LER 62-degree series are already included. EXPLORE SCIENTIFIC is an established manufacturer of very high quality eyepieces in the astronomical 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 62-degree LER series eyepieces. With an apparent field of view of 62 degrees and a focal length of 20 mm, the BT-70 binoculars produce a magnification of 20x. Therefore, these wide-angle eyepieces offer a very good overview (3.1-degree field of view) at moderate magnification. The large interpupillary distance of these 15 mm LER (long eye relief) eyepieces and the soft silicone eyecups, which can be turned upside down, also ensure comfortable and relaxed viewing. For astronomy, a flat, sharp image field is advantageous and offers a particularly impressive viewing experience even during the day. Due to the water-resistant design and argon filling, these eyepieces are absolutely durable and easy to clean.

Interchangeable eyepieces with 1.25 inch / 31.7 mm plug-in diameter
Adjust the magnification and field of view to your individual needs and choose from a wide range of available eyepieces. All types of eyepieces with an insertion diameter of 1.25 inch / 31.7 mm can be used with the BT series binoculars. Especially recommended are the EXPLORE SCIENTIFIC eyepieces of the 62 and 82 degree series with focal lengths from 8 to 26 mm (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 attached to the binoculars by means of 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 onto the thread of the eyepiece sleeves. Of course, the use of color and nebula filters should always be done in pairs. All EXPLORE SCIENTIFIC screw filters with a diameter of 1.25 inch / 31.7 mm (see item no. 03102xx) are suitable

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

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

Suitable tripods and tripod connection
When using these large binoculars, a sturdy photographic tripod with adequate load capacity is strongly recommended. The connection is made via two 1/4 inch or one 3/8 inch threaded holes (standard photographic tripod thread) on the tripod adapter of the binoculars. The ideal solution is to use the optional EXPLORE SCIENTIFIC U-mount available with field tripod (item no. 0114300). It is specially designed for the large binoculars of the BT series and transports these devices absolutely securely. The excellent mechanism with adjustable friction on both axes allows easy movement and tracking. The binocular position remains stable depending on the adjusted friction intensity. Vibrations are reduced to a minimum thanks to the massive U-mount construction and the large stainless steel tripod. Even at high magnifications there is no vibration and the finest details can be observed.

GENERAL FEATURES:

• Large binoculars for starry sky, nature and landscape observation
• See globular star clusters, glowing gas nebulae, the moon with its craters and even planets.
• Wild animals, ships and airplanes can also be seen in detail.
• The high light-gathering lenses produce a bright, high-contrast image.
• All-round binoculars, but especially suitable at twilight and night
• Comfortable 45-degree viewing angle allows for fatigue-free use
• One full-lens telescope with maximum light-gathering power is available per eye
• Extremely rugged magnesium housed, sealed, nitrogen-filled binoculars
• Two 20 mm EXPLORE SCIENTIFIC LER series 62-degree 20 mm eyepieces already included
• 20x magnification and 62-degree apparent field of view, 3.1-degree real field of view
• Large interpupillary distance of 15 mm to the eyepiece lens for comfortable viewing
• Interchangeable eyepieces with standardized 1.25 inch / 31.7 mm plug-in diameter
• Magnification can be adjusted with optional 15x to 50x eyepieces
• Precise brass eyepiece compression ring clamps for tilt-free adjustment
• Color and nebula filters can be used for astronomical observations.
• Extendable dew caps prevent fogging of external objective lenses and stray light
• Integrated carrying handle facilitates easy transport and tripod mounting
• Tripod connection via two 1/4 inch or one 3/8 inch threaded holes (standard photographic tripod thread)
• Tripod recommendation: EXPLORE SCIENTIFIC U-mount with field tripod (Art.No. 0114300)
• Lens type: Air-gap achromatic lens (2 elements/ 1 group)
• Coating: full multi-coating on all optical surfaces
• Aperture, focal length and aperture ratio: 70 mm / 400 mm / F=5.7
• Sealed to IPX6 standard and nitrogen-filled: yes / yes
• Close focusing distance: 12 meters
• Eyepiece mount diameter: 1.25''/ 31.7 mm
• Adjustable interpupillary distance: 54 to 76 mm
• Single helical focus: yes
• BAK-4 prism system for a bright, high contrast image
• Binocular dimensions and weight: 370 x 213 x 122 mm, 3,4 kg
• Binocular housing color: white

TECHNICAL SPECIFICATIONS:

optical Design: Achromatic Refractor
Porro: Magnification 20
Mirror/Lens Diameter: 70mm
Focal Length: 400mm
Aperture Ratio: 5.7
Apparent Field of View: 62 degrees
Prism Material: BaK-4
Coating Type: Enhanced Multi-Layer Deposition (EMD)
Exit pupil min. 3.5mm
Eyepieces for spectacle wearers ✓
Diopter adjustment ✓
Field of view: 3.1 degrees
Close focus from: 12 m

GENERAL TECHNICAL DATA
Waterproof ✓
Protection level: IPX6
Inert gas purged ✓
Tripod adapter thread ✓
Focusing system: Single eyepiece focusing
Single eye adjustment ✓
Eyepieces: Rubber eyepieces, collapsible
Min interpupillary distance: 54mm
Max interpupillary distance: 76mm
Eyepiece relief: 15mm
color: white
Body material: magnesium
Dust caps: Dust protection caps for front lens and eyepiece holder

DIMENSIONS AND WEIGHTS
Total length: 370 mm
Total width: 213 mm
Total height: 122 mm
Total net weight (incl. accessories): 3400 g

what comes in the box?

• Giant binocular with carrying handle (without tripod)
• Eyepieces ES 20mm 62 degrees LER series (2 pcs)
• Precisely fitting foam insert for transportation
• Dust covers for objectives and eyepiece shells
• Instruction manual

Giant binoculars Explore Scientific BT-70 SF with 20mm 62º LER eyepieces