Vixen BT-ED70S-A Binocular Telescope

Large binoculars with ED glass 70 mm objectives, for aesthetic observation of the starry sky, nature and landscape

• Large binoculars with 70 mm objective lenses with ED glass
• 31.7 mm (1.25 inch) eyepiece sleeves for interchangeable eyepieces
• Very colour-free, high-contrast and sharp images
• Moon, nebulae, galaxies, star clusters and nature observations
• Individual eyepiece focusing, 45-degree viewer
• Interpupillary distance of the eyepiece adjustable
• GP rail, tripod thread, carrying handle and viewfinder shoe
• Travel binoculars can also be used with photo tripods
• Dimensions: 400 × 190 × 155 mm , Weight: 4 kg
• High quality product - Made in Japan

Large binoculars with 70 mm ED glass objective lenses
Observe the beauty of the starry sky at night and distant objects in nature during the day. By customer request, we have succeeded in producing a new edition of these legendary binoculars. The ED glass lenses guarantee enormously high sharpness, contrast and colour purity even during the day. Globular clusters, luminous 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, aircrafts and animals can be seen in detail at long distances. With the binoculars of the Vixen BT series, you can bring everything up close. The large, fast ED lenses in combination with the ultra modern magnesium fluorite coatings on all lens surfaces enable maximum light transmission. Thus, these binoculars produce bright, sharp and high-contrast images even at night and dusk, allowing for a particularly aesthetic viewing pleasure.

Comfortable travel binoculars can also be used with photo tripods
The comfortable 45-degree viewer enables comfortable viewing even when the binoculars are tilted towards the zenith. The BT-ED70S-A large binoculars are 4 kg light and particularly portable. An attached metal carrying handle ensures easy transport and a secure grip during tripod mounting. The binoculars have a standard Vixen dovetail rail as well as a standard 1/4 and 3/8 inch photo tripod thread. They can therefore be used on almost all common photo tripods and telescope mounts.

The ideal binocular mount
However, we recommend the Vixen HF2 fork mount for mounting. Thanks to its sophisticated design and precision mechanics, it offers perfect viewing comfort and practically zero vibrations. Especially for astronomical observations, a solid mount with tripod is one of the most important accessories. This guarantees observation without shaking and allows you to see even the finest details.

Interchangeable 1.25-inch eyepieces
Stay flexible and use your favourite eyepieces and ideal magnification. The BT-ED70S-A has standardised 1.25-inch eyepiece holders, allowing you to change eyepieces at any time.

Which eyepieces can be used?
All eyepieces with a 1.25'' barrel. Eyepieces with focal lengths of 8 to 26 mm are particularly recommended. The magnification can thus be varied from approx. 15x to 50x (focal length of binoculars : focal length of eyepiece = magnification). The eyepieces are held in the binoculars by a precise brass ring clamp and guarantee a tilt-free position. Depending on the interpupillary distance, the outer diameter of the eyepiece housing should not exceed a value of approx. 50 mm. Of course, two identical eyepieces of the same series should always be used.

Use of colour and nebula filters for astronomical observations
Increase the contrast and visibility of objects and details by screwing the appropriate filters directly into the thread of the eyepiece sleeves. Of course, colour and nebula filters must always be used in pairs. All EXPLORE SCIENTIFIC screw-in filters with 1.25''/31.7 mm diameter are suitable (see Art. No. 03102xx).

Comfortable 45-degree viewer and single focusing
The 45-degree viewer enables a relaxed observation position even when the binoculars are heavily tilted. The individual interpupillary distance can also be adjusted within a range of 58 to 102 mm. The fine helical focusing system makes precise focusing simple and effortless.

Retractable dewcaps
The integrated dew caps can be pulled out in high humidity and cold conditions. This prevents fogging of the outer objective lenses and effectively shields from additional stray light coming in from the side.


FEATURES

• Objective lenses: 70 mm / ED apochromatic
• Full multi-coating on all lens surfaces
• Focal length 400 mm (F = 5.7)
• Resolving power: 1.66 arcseconds
• Limiting magnitude: Mag 11.0
• Dimensions: 400 × 190 × 155 mm
• Weight: 4 kg
• Adjustable interpupillary distance: 58-102 mm
• Integrated and retractable dew caps
• Viewfinder shoe: Vixen Standard
• Eyepiece mount: 1.25 inch / 31.7 mm barrel diameter
• Single eyepiece focusing
• Tripod mount: GP dovetail rail, 1/4 and 3/8 inch photo tripod threads.

SCOPE OF DELIVERY

• BT-ED70S-A Large Binoculars (without eyepieces)
• Vixen finder shoe
• Integrated dew caps
• Dust cover
• Carrying handle

 

Technical Data

FIELD OF APPLICATION
Field of application	Astronomy Night telescopes Bird watching & Nature observation
Field of application	Deep Sky Observation Land observation Lunar observation Planetary observation
PRODUCT FAMILY
Product Family	Refractor telescope
TYPE
Type	Giant Binoculars
OPTICAL SPECIFICATIONS
Optical design	Apochomatic Refractor
Magnification Zoom max.	50
ED glass	✓
Mirror/Lens diam.	70 mm
Material prismn	BaK-4
Type of coating	Fully multi-coated
Colour of coating	green
Number of lenses	2
Diopter setting	✓
GENERAL TECHNICAL DATA
Colour	white
Body material	Aluminium
Tripod adapter thread	✓
Focusing system	1.25" Helical focuser
Single eye adjustment	✓
Interpupilar distance min.	58 mm
Interpupilar distance max.	102 mm
Dust protection caps	Dust protection caps for front lens and eyepiece holder
DIMENSIONS & WEIGHTS
Total length	400 mm
Total width	190 mm
Total height	155 mm
Net weight (without access.)	4000 g