Product Highlights
Fast 70mm high-performance astrograph F5.5 for demanding astrophotographers and observers with 5 lens elements in 5 groups
- Very fast 70mm high-performance astrograph for demanding astrophotographers
- Due to the large lenses there is almost no vignetting
- Complex construction with 5 lens elements in 5 groups for absolute correction
- Needle-thin stars up to the edge of the image field even with 44 x 33 mm camera format
- Large, stable eyepiece extension, also suitable for heavy cameras
- Extremely high sharpness, colour purity and contrast thanks to SD lenses
- Very large field illumination up to 55mm
- High Strehl intensity of 96.7% at visible wavelengths
- Optional reducer available for even faster results
- Optional motor focuser with two speeds can be retrofitted
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
With its sophisticated optical design incorporating five lens elements in five groups (Quintuplet), including two SD (Super ED) lenses and one ED (Extra-low Dispersion) lens, this astrograph delivers a virtually aberration-free optical system. The convex lens utilises two SD lenses and a high-refractive ED lens, while the front lens is crafted from a newly developed high-performance lanthanum glass.
Perfect for astrophotography and visual observation
This revolutionary astrograph is compatible with digital full-frame DSLRs and even larger 44 x 33 mm cameras. With its fast F5.5 aperture ratio, the 70mm astrograph produces exceptionally sharp, high-contrast, pinpoint stars from the centre to the very edges of the field of view. Not only is it ideal for astrophotography, but it also excels in visual observation, offering a wide field of view for deep-sky objects and delivering stunning detail in planetary observation with high magnification.
Consistently sharp imaging across the entire field
The VSD70ss is designed with a long peak range in focus adjustment accuracy, making it easier for astrophotographers to achieve consistently outstanding results. Even if the focus isn’t set perfectly, stars remain round and sharp across the entire image field.
The VSD70ss is very temperature-resistant so that you always keep a very stable focus point.
Minimal vignetting for uniform illumination
Most astrographs experience some level of optical vignetting (light gradually diminishes towards the image edges). This is mainly caused by the rear lenses being shadowed by the front lenses. As a result, photographers often need to apply image corrections or capture additional flat frames beforehand. The VSD70ss tackles this issue with large-aperture lenses in the rear elements and preserves over 90% of the light all the way to the edge of its 55mm image circle. The result is uniform brightness across the entire field, eliminating the need for extensive post-processing to compensate for edge darkening.
The VSD70ss features cutting-edge multi-coatings with exceptionally high reflectivity. These coatings have been specially designed to optimise the performance of each individual lens element, ensuring maximum contrast and light transmission without degradation across multiple lenses.
Note:
*Mechanical vignetting may still occur depending on the camera system used, particularly due to the camera body or incorrect adapters.
96.7% Strehl for stunning visual observations
When paired with a wide-angle eyepiece with low magnification the VSD70ss offers a flattened large field of view. Even with a high-quality wide-field eyepiece with a large field of view, stars appear sharp across the entire field of view during visual observation.
At the centre of the field, the telescope achieves an impressive 96.7% Strehl intensity at visible wavelengths—surpassing even the acclaimed SD81SII apochromat with its 95.7% Strehl ratio. This superior optical quality is also evident when observing the Moon and planets at high magnifications.
Large, versatile, and stable focuser
The VSD70ss has a large focuser with a diameter of 87.5mm to make optimum use of the large 55mm field of illumination. Designed to support a wide range of accessories, this large focuser is perfect for astrophotography, accommodating everything up to large-format cameras or 35mm full-frame DSLR cameras. Its precision manufacturing ensures excellent stability, preventing any tilting even when using heavy imaging equipment.
Optional VSD reducer for even faster results
The new reducer has been specially developed for the VSD90ss and the VSD70ss. At a focal ratio of 1:3.9. the photographer gets even faster results in astrophotography.
Compatible with motorised focusers
To enable sensitive focusing, an optional dual-speed motor focuser is available for the VSD70ss.
Additionally, an EAF (Electronic Automatic Focuser) from ZWO or a compatible system can be retrofitted.
FEATURES
- SD apochromat, 5-element/5-group, AS coating
- Aperture: 70mm
- Focal length: 385mm (F/5.5)
- Resolution: 1.66
- Limiting magnification: 11.0
- Light gathering power: 100x more than the eye
- Field of view: 55mm
- Tube dimensions: 444 x 90 mm (368mm retracted)
- Adapters/Threads: 84mm (P=1mm), 60mm (P=0. 75mm), 42mm (P=0.75mm for T-ring)
- Connections: 60.2mm, 50.8mm, 31.7mm
- Weight: 3.5 kg
SCOPE OF DELIVERY
- VSD70ss Astrograph
- Adapter: 60.8mm to 50.2mm
- 1/4 inch screws (L: 9mm) x 2
- Allen keys (3mm, 2mm, 1.5mm, 3/16 inch)
- Dovetail bar (Vixen standard)
Angular resolution (arc seconds): | 1.66 |
---|---|
Aperture ratio: | 5.5 |
Batteries included: | 0 |
Batteries required: | 0 |
Colour: | silver/white |
Colour of coating: | green |
Compass: | 0 |
Dust protection caps: | Dust protection caps for front lens and eyepiece holder |
ED glass: | 1 |
Field of application [Telescopes]: | Deep Sky Observation, Deep Sky Photography, Lunar observation, Planetary observation |
Focal length (mm): | 385 |
Focus Group [Telescopes]: | Advanced Amateurs, Specialists and Research, Visual enthusiasts |
Material OTA: | Aluminium |
Material front lens or corrector plate: | Ohara Japan FPL-53 ED glass |
Maximum recommended magnification: | 140 |
Mirror/Lens diam. (mm): | 70 |
Net weight OTA (incl. accessories) (kg): | 3500 |
Optical design: | Apochomatic Refractor |
Power supply unit included: | 0 |
Product Family [Telescopes]: | Refractor telescope |
Reticle: | 0 |
Total height (mm): | 144 |
Total length (mm): | 444 |
Total width (mm): | 174 |
Transportability: | very good |
Tripod height adjustment: | 0 |
Type of coating: | Fully multi-coated |
Type of tripod thread: | 60 mm |
Visual limiting magnitude (approx., mag): | 11 |
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Produkt- und Sicherheitshinweise
Manufacturer:
Bresser GmbH, Gutenbergstraße 2, 46414 Rhede
www.bresser.de
- 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.