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
£1,691.00*
Available, delivery time: 3-5 working days
Product number:
X014305
EAN:
4955295143054
WEEE-Reg.-Nr.:
DE 34323861
With BRESSER, you can enjoy a smooth introduction to the vast world of astronomy. Our detailed information ("Telescope Guide") provides valuable tips for beginners—but even experienced astronomers can use the information we provide (e.g., tables for the geographical latitude of all major world cities) as a reference.
Here is the table of contents of the comprehensive BRESSER Telescope Guide:
- 2. The View into the Starry Sky
- 2.1 Observing with the Naked Eye
- 2.1.1 Observing Constellations with the Naked Eye
- 2.2 Observing with Binoculars
- 2.2.1 Observing Planets and Moons with Binoculars
- 2.2.2 Observing Deep Sky Objects with Binoculars
- 2.2.3 Every Beginning is Easy
- 2.3 Observing with a Telescope
- 2.4 The Moon
- 2.4.1 The Moon Phases
- 2.4.2 The Far Side of the Moon
- 2.4.3 The Moon Map
- 2.4.4 Maria (Seas)
- 2.4.5 Mare
- 2.4.6 Craters
- 2.4.7 The Ray Craters
- 2.5 Observing the Solar System with a Telescope
- 2.5.1 Where are the Planets?
- 2.5.2 Planet Observation
- 2.5.3 The Position of the Planets Relative to the Sun
- 2.5.4 The Planets Introduce Themselves
- 2.5.5 Deep Sky Observation with a Telescope
- 2.6 Practical Observation Tips and Tricks
- 2.6.2 Tips for Optimal Observation Conditions
- 2.7 The Most Beautiful Objects Throughout the Year
- 4. Telescopes
- 4.1 The Telescope as an Observation Instrument
- 4.2 Optics
- 4.2.1 Refractor (Lens Telescope)
- 4.2.2 Reflector (Mirror Telescope)
- 4.3 Mechanics
- 4.3.1 Altazimuth Mount
- 4.3.2 Equatorial Mount
- 4.3.3 Drive Motors
- 4.4 Accessories
- 4.4.1 Eyepieces
- 4.4.2 Important Tips for Eyepiece Selection
- 4.4.3 Filters
- 4.4.4 Photographic Accessories
- 4.4.5 Other Accessories
- 5.1 Which Telescope for Whom?
- 5.1.1 Deep-Sky Observations
- 5.1.2 Observing Closer Planets
- 5.1.3 The Topic of Portability
- 5.1.4 Price Factor When Buying a Telescope
- 6. Useful Tables
- 6.1 Table for the Geographic Latitude of All Major World Cities
- 6.1.1 Observers in the Northern Hemisphere (N):
- 6.1.2 Observers in the Southern Hemisphere (S):
- 6.2 Lookup Table for Notable Stars
- 6.3 Getting Acquainted with the Universe - or: Distances in Space
Sky Guides by Bresser
The Sky Guide provides comprehensive information on constellations, planetary positions, and astronomical events – perfect for planning your observations and delving deeper into astronomy.
Visit the guide directly here to make the most of your observations!
With Bresser recreational optics, you are always perfectly equipped! We bring you closer to the uniqueness of the moment.
Our wide range includes: binoculars, night vision devices, targeting and precision optics, surveillance cameras, as well as spotting scopes and telescopes. Bresser stands for high quality combined with affordable prices. With our Binocular ABC, Binocular Guide, and an introduction to the history and key features of binoculars, we are happy to assist you before and after your purchase.
True art of living consists in seeing the wonderful in the everyday. (Pearl S. Buck)
Table of Contents
1. The History2. The Features
2.1 The Key Figures
2.2 The Magnification
2.3 The Objective Diameter
2.4 The Exit Pupil
2.5 The Twilight Factor
2.6 The Brightness
2.7 The Interpupillary Distance
2.8 The Eye Relief (Focal Point of the Eyepiece)
2.9 The Field of View
2.10 The Focus
2.11 The Rubber Armor
3. The Glass
3.1 The Coating
3.2 The Glass Material
3.3 Porro or Roof Prisms
3.4 Achromats
4. Types of Binoculars
4.1 Binocom or Nautic
4.2 Night Glass or Night Vision Device
4.3 Residual Light Amplifiers
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Product information "BT-ED70S-A Binocular Telescope"
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
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
SCOPE OF DELIVERY
- 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
| Batteries included: | No |
|---|---|
| Batteries required: | No |
| Body material: | Aluminium |
| Colour: | white |
| Colour of coating: | green |
| Compass: | No |
| Diopter setting: | Yes |
| Dust protection caps: | Dust protection caps for front lens and eyepiece holder |
| ED glass: | Yes |
| Eyepieces for eyeglass wearers: | No |
| Field of application [Binoculars]: | Astronomy , Bird watching & Nature observation , Night , telescopes |
| Field of application [Telescopes]: | Deep Sky Observation , Land observation , Lunar observation , Planetary observation |
| Focusing system: | 1.25" Helical focuser |
| Inert gas purged: | No |
| Interpupilar distance max. (mm): | 102 |
| Interpupilar distance min. (mm): | 58 |
| LE Eyepieces: | No |
| Magnification Zoom max.: | 50 |
| Material: | Aluminium |
| Material prisms: | BaK-4 |
| Mirror/Lens diam. (mm): | 70 |
| Net weight (without access.) (g): | 4000 |
| Number of lenses: | 2 |
| Optical design: | Apochomatic Refractor |
| Power supply unit included: | No |
| Product Family [Binoculars]: | Großfernglas |
| Single eye adjustment: | Yes |
| Total height (mm): | 155 |
| Total length (mm): | 400 |
| Total width (mm): | 190 |
| Tripod adapter thread: | Yes |
| Type [Binoculars]: | Giant Binoculars |
| Type of coating: | Fully multi-coated |
| Waterproof 8): | No |
| Zoom function: | No |
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Product and safety instructions
Manufacturer:
Bresser GmbH, Gutenbergstraße 2, 46414 Rhede
Contact:
www.bresser.de
www.bresser.de
Warning notes
- General safety instructions DANGER Risk of suffocation! Improper use of this product can result in suffocation, especially for children. Therefore, carefully observe the following safety instructions. Keep packaging materials (plastic bags, rubber bands, etc.) away from children! There is a risk of suffocation! Keep cords, ribbons, and similar materials away from children! They could accidentally strangle themselves and suffocate! NOTE Risk of material damage! Improper handling can damage the device and/or accessories. Therefore, only use the device according to the following safety instructions. Do not dismantle the device! In the case of a defect, contact your dealer. They will contact the service center and may send the device in for repair.
- Never look at the sun through an eyepiece/telescope without a certified protection filter. A moon filter can never be used for solar observation. The moon filter is only suitable for moon observation. The solar filter must be mounted in front of the telescope opening, not at the eyepiece. Otherwise, the concentrated light beam through the optics will immediately destroy the filter foil, leading to severe eye damage, including permanent blindness.
- Never leave the optics unattended. Children and inexperienced adults could point the telescope at the sun without proper precautions and lose their eyesight.
- Do not expose the device to high temperatures.
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Accessories
Vixen HF2 Fork Mount
£323.00*
The HF2 mount is an azimuthal fork mount for mounting large binoculars.
It also requires the X000161 mounting plate for attachment of different binocular types.
Not required with the BT126S-A.
FEATURES
Can be used with: SXG-HAL130, SXG-AL130, APP-TL130
Bearing capacity: 13 kg
Weight: 3.4 kg
WHAT’S INCLUDED
HF2 fork mount
Mounting tool
Incoming
Vixen Mounting Plate for large Binoculars in the HF2 Fork Mount
£154.00*
This plate is designed for large binoculars with 1/4’’ photo thread screws.
It is inserted into the HF2 fork mount. The maximum width of the binoculars must be 251mm in order for them to be mounted.
FEATURES
Mounting plate for large binoculars and BT series
Weight: 1 kg
WHAT’S INCLUDED
Mounting plate for large binoculars
1/4’’ photo thread screw
Available
Vixen APP-TL130 Tripod for AP, GPD & SX Mounts
£195.00*
The APP-TL130 tripod is a lightweight, portable tripod for all standard Vixen mounts with a 45 mm support.
Compatible tripods include the Vixen HF2, SX, AP and AXJ mounts.
The tripod is adjustable in 3 sections and can be retracted to a very small size.
Weighing just 3 kg, it is ideal for astronomy trips.
FEATURES
Leg section: 3x extendable
Maximum extended height: 1296 mm
Minimum retracted height: 598.4 mm
Material: Aluminium
Weight: 3.0 kg
Maximum height: 1159 mm (height above the ground)
Minimum height: 526 mm (height above the ground)
WHAT’S INCLUDED
Aluminium tripod
Adjustment pins for GP2, GPD2, AP and SX mounts
Available
Vixen SXG-HAL130 Aluminum Tripod for GP, SX & AP Mounts
£258.00*
High-quality, stable aluminium tripod for a variety of mounts with 45 mm connections.
The aluminium profile ensures firm positioning with a minimum amount of vibration.
Suitable for GP2, GPD2, AP, SX, SXP, SXP2 and AXJ mounts or similar with 45 mm connections.
FEATURES
Robust aluminium tripod without mount
Suitable for: GP-, SX- & AP mounts
Height-adjustable: 81 - 130 cm
Weight: 5.5 kg
WHAT’S INCLUDED
Aluminium tripod
Adjustment pins for GP2, GPD2, AP and SX mounts
Available
Vixen SLV 50° Eyepiece 10mm (1.25'')
£133.00*
The Vixen SLV series are the modern take on the classic Vixen Lanthanum eyepieces. These eyepieces were legendary for their generous eye relief and precise nature, making them a firm favourite with planetary, lunar and double star observers. This 10mm is an excellent eyepiece for medium to higher power on most telescopes, an ideal premium replacement for eyepieces supplied with telescopes, especially good for Planetary observers. The SLV Series of Vixen Eyepieces feature a hexagonal shaped eyepiece body, long 20mm eye relief, and twist up click stop eyecup for adjusting to the most comfortable viewing. The SLV eyepieces feature high grade lanthanum glass, and deliver remarkably clear and high contrast star images to the edge of the field of view. The lenses are fully multicoated for high light transmission.Size 31.7mm/1.25"Apparent FOV 50°Eye relief 20mmWeight 168g (5.92oz)
Available
Vixen SLV 50° Eyepiece 12mm (1.25'')
£133.00*
The Vixen SLV series are the modern take on the classic Vixen Lanthanum eyepieces. These eyepieces were legendary for their generous eye relief and precise nature, making them a firm favourite with planetary, lunar and double star observers. This 12mm is an excellent eyepiece for medium to higher power on most telescopes, an ideal general purpose eyepiece and major improvement over standard eyepieces. The SLV Series of Vixen Eyepieces feature a hexagonal shaped eyepiece body, long 20mm eye relief, and twist up click stop eyecup for adjusting to the most comfortable viewing. The SLV eyepieces feature high grade lanthanum glass, and deliver remarkably clear and high contrast star images to the edge of the viewing circle. The lenses are fully multicoated for high light transmission.Size 31.7mm/1.25"Apparent FOV 50°Eye relief 20mmWeight 168g (5.92oz)
Available
Vixen SLV 50° Eyepiece 15mm (1.25'')
£133.00*
The Vixen SLV series are the modern take on the classic Vixen Lanthanum eyepieces. These eyepieces were legendary for their generous eye relief and precise nature, making them a firm favourite with planetary, lunar and double star observers. This 15mm SLV is an excellent eyepiece for medium power for most telescopes, an ideal general purpose eyepiece and provides excellent comfort with long eye relief. The SLV Series of Vixen Eyepieces feature a hexagonal shaped eyepiece body, long 20mm eye relief, and twist up click stop eyecup for adjusting to the most comfortable viewing. The SLV eyepieces feature high grade lanthanum glass, and deliver remarkably clear and high contrast star images to the edge of the viewing circle. The lenses are fully multicoated for high light transmission.Size 31.7mm/1.25"Apparent FOV 50°Eye relief 20mmWeight 168g (5.92oz)
Available
Vixen SLV 50° Eyepiece 20mm (1.25'')
£133.00*
The SLV eyepieces with high-quality lanthanum glass provide remarkably clear and high-contrast star images right up to the edge.The lenses are fully multi-coated for high light transmission.Thanks to the large and comfortable eye relief distance of 20 mm , the eye comfort is maintained, even during longer observing sessions.Even those who wear glasses will have the entire field of view is clearly visible.The click stop eyecups can be tuned up or down to the user's preference.PROPERTIESVery high sharpness and contrast across the entire field of viewComfortable eye relief of 20mmalmost no colour defects due to lanthanum glass1.25" 31.7 mm barrel sizeTurn-down eyecup for people who wear glassesWeight: 155 gWHAT'S INCLUDEDVixen SLV 50 ° eyepieceDust caps
Available
Vixen SLV 50° Eyepiece 25mm (1.25'')
£133.00*
The Vixen SLV eyepieces use high-quality lanthanum glass to deliver remarkably clear and high-contrast star images right up to the edge of the field of view.All lenses are fully multi-coated for high light transmission.Twist up eyecups allow the user to set observing height to their own comfortable specification. 20mm eye relief means that even those who have to wear glasses to observe are able to see right to the edge of the field of view.PROPERTIESVery high sharpness and contrast across the entire field of viewComfortable eye relief of 20mmalmost no chromatism visible due to lanthanum glass31.7 mm receptacle connectionEyecup that can be turned down for glasses wearersWeight: 151gWHAT'S INCLUDEDVixen SLV 50 ° eyepieceDust caps
Available
OCULUM VERLAG - Fernrohr-Führerschein in 4 Schritten (GERMAN)
£19.90*
Please note that this astronomy book for beginners is only available in German.
Available
Vixen Smartphone Adapter for Photography with Binoculars, Telescopes, Spotting Scopes and Microscopes
£93.00*
Make your smartphone into a photographic all-rounder with a pair of binoculars, a spotting scope, telescope or microscope.This universal smartphone holder was developed by Vixen, and is compatible with a wide range of smartphones and other lenses.
The adapter fits onto eyepieces with a diameter of 19 to 53 mm. The size of the smartphone can be between 58x108 mm and 110x200 mm.
The eyepiece clamp keeps the adapter centered and holds your smartphone in place. Take stunning photos of the moon's craters through your telescope, or photograph birds or other distant objects through your binoculars.The adapter is very easy to use.It is recommended to use eyepieces with a long eye relief in order to minimise vignetting.FEATURESSuitable for almost any smartphoneEase to useDesigned for eyepieces with a diameter of 19 to 53 mmCan be used with binoculars, telescope, spotting scope or microscopeDimensions: 149 mm x 90 mm x 56 mmWeight: 178 g DELIVERY CONTENTSmartphone adapter
Available
