Product Highlights
BT-70 SF giant binoculars with 62° LER eyepieces 20mm for observation of the starry sky and terrestrial objects. Always with you on every excursion.
- Giant binoculars with large 70mm objective diameter
- Observation of the starry sky and terrestrial objects
- Extremely robust binoculars, sealed and nitrogen filled
- Comfortable 45 degree view and single focus, carrying handle
- Two high-quality ES 62 degree LER eyepieces 20mm Ar included
- Eyepiece mount 1.25 inch / 31.7mm, interchangeable eyepieces
- Suitable eyepieces of the ES 62 or 82 deg. series available
- Extendable dew caps prevent misting on the lenses
- Tripod connection: 2 x 1/4 inch + 1 x 3/8 inch photo thread
- Mount recommendation: 0114300 U-mounting with field tripod
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
Entdecken Sie unsere Ratgeber!
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 von Bresser
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.
Large binoculars 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
FEATURES
- Large binoculars for observing the starry sky, nature and landscape
- Observe globular star clusters, glowing gas nebulae, the moon with its craters and even planets
- Also wild animals, ships and airplanes can be seen in detail
- Highly light gathering lenses produce a bright and high-contrast image
- All-round binoculars, but especially suitable in twilight and at night
- The comfortable 45 degree viewing angle allows fatigue-free use
- One complete lens telescope with the full light gathering power is available per eye
- Extremely robust binoculars with magnesium housing, sealed and filled with nitrogen
- Two EXPLORE SCIENTIFIC 20mm eyepieces of the 62 degree LER series already included
- 20x magnification and an apparent field of view of 62 degrees, true visible field of 3,1 degrees
- Large interpupillary distance of 15mm to the eyepiece lens for comfortable viewing
- Eyepieces interchangeable and with standardized plug-in diameter of 1.25 inch / 31.7mm
- The magnification can be adjusted with optional eyepieces from 15x to 50x
- Precise brass eyepiece compression ring clamps for tilt-free fit
- Color and nebula filters can be used for astronomical observations
- Extendable dew caps prevent fogging of the outer objective lenses and stray light
- Integrated carrying handle facilitates transport and mounting on the tripod
- Tripod connection via two 1/4 inch or one 3/8 inch threaded holes (standard photo tripod thread)
- Tripod recommendation: EXPLORE SCIENTIFIC U-mount with field tripod (Art.No. 0114300)
- Objective type: Air spaced achromatic lens (2 elements/ 1 group)
- Coating: full multilayer coating on all optical surfaces
- Aperture, focal length and aperture ratio: 70mm / 400mm / F=5.7
- Sealed to IPX6 standard and nitrogen filled: yes / yes
- Close focus distance: 12 meters
- Eyepiece mount diameter: 1.25'' / 31.7mm
- Adjustable interpupillary distance: 54 to 76 mm
- Helical single focus: yes
- BAK-4 prism system for a bright and high-contrast image
- Dimensions and weight of binoculars: 370 x 213 x 122mm, 3.4kg
- Housing color of binoculars: white
- Giant binoculars with carrying handle (without tripod)
- Eyepieces ES 20mm 62 degrees LER Series (2pcs)
- Precisely fitting foam insert for transport
- Dust covers for objectives and eyepiece sockets
- Instruction manual
Body material: | Magnesium |
---|---|
Colour: | white |
Dust protection caps: | Dust protection caps for front lens and eyepiece holder |
Eyecups: | Rubber eyecups, foldable |
Focusing system: | Individual eyepiece focus |
Level of protection: | IPX6 |
Material: | Magnesium |
Material prisms: | BaK-4 |
Optical design: | Achromatic Refractor, Porro |
Type [Binoculars]: | Giant Binoculars |
Type of coating: | Enhanced Multilayer Desposition (EMD) |
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