Fast 70 mm high-performance Astrograph F5.5 for demanding astrophotographers and observers with 5 lens elements in 5 groups
The complex optical design, including two SD (Super ED) lenses and one ED (Extra-low Dispersion) lens, has resulted in a virtually aberration-free optical system. The convex lens uses two SD lenses and a highly refractive ED lens, while the front lens uses a newly developed high-performance lanthanum glass.
Ideally suited for photography and visual observation
This revolutionary astrograph is compatible with a full-frame digital SLR or an even larger 44x33 mm camera. The 70 mm astrograph with a fast F5.5 aperture ratio delivers exceptionally sharp, high-contrast and small point-like stars from the centre to the corners of the field of view. It is also ideal for visual observation with a very large field of view, but also for planetary observation at high magnifications.
Consistently sharp images across the entire field of view
The VSD70ss is designed to have a "long peak range" in the focus accuracy so that photographers can always achieve satisfactory results in astrophotography. Even if the focus is not quite right, round and sharp stars are still reproduced across the entire image field.
The VSD70ss is very temperature-resistant, so you always maintain a fairly stable focus point.
Illumination with almost no vignetting
In most cases, an astrograph also produces optical vignetting (a gradual decrease in the light rays towards the edge of the image). This is mainly caused by the rear lenses, which are shaded by the front lenses. Because of this darkening, it is relatively normal for the photographer to have to edit the image further after shooting and also to take a few additional flats beforehand. To solve this problem, the VSD70ss telescope uses large-aperture lenses in the rear elements and secures over 90% of the light volume to the edge of the 55 mm image circle. Since the light intensity is uniform across the entire image field of the VSD70ss, there is no need for complex technology to prevent edge darkening.
The VSD70ss Astrograph offers a large, flat image field with a low-magnification wide-angle eyepiece. Even with a high-quality wide-field eyepiece with a large field of view, you will get sharp images of stars throughout the entire field of view during visual observation!
A Strehl ratio of 96.7% is achieved in the centre of the field of view at visible wavelengths. This Strehl ratio exceeds that of the SD81SII apochromat with 95.7%, which is known for its excellent optical properties. And this strength is also evident in observations of the Moon and planets at high magnifications.
The VSD70ss telescope is coated with the latest coatings with extremely high reflectivity. These coatings have been specially developed to optimise the properties of each individual lens element without compromising contrast and light intensity when multiple lenses are used.
The VSD70ss has a large focuser with a diameter of 87.5 mm to make the most of the large 55 mm field of view. With the large focuser, which is compatible with many accessories, it is perfect for astrophotography up to large format or 35 mm full-frame DSLR cameras. Thanks to its precise manufacturing, it is also suitable for very heavy cameras without tilting.
The EAF (Electronic Automatic Focuser) from ZWO can be retrofitted.
Scope of delivery:
- VSD70ss Astrograph
- Adaptors: 60.8 mm to 50.2 mm
- 2 x 1/4-inch screws (L: 9 mm)
- Hex keys (3 mm, 2 mm, 1.5 mm, 3/16 inch)
- Dovetail rail (Vixen standard)
It not only matters which telescope you buy but also where you buy it. Our additional services:
- We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
- We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.
