Focal length reducer for the VSD90ss and VSD70ss with two ED lenses designed for high-end astrophotographyThe two ED lenses maximise the photographic performance of the VSD90ss and the VSD70ss, which are designed for both photography and visual observation. The reducer can illuminate an image circle of 44 mm (suitable for a 34x36 full-frame format). The reducer has a very sophisticated design as it contains four elements in four groups, including 2 ED lenses. Thanks to its larger lens diameter, it offers significantly improved image illumination compared to its predecessor, the smaller V0.79x reducer. The star distortion at the edges is also reduced to an absolute minimum.The focal length of the VSD90ss telescope is shortened by about 0.71x and the focal ratio is reduced from 5.5 to 3.9. This results in a super-fast f3.9 astrograph, capable of fully illuminating a full-frame DSLR camera.
FEATURES
- Magnification: 0.71x
- Focal length VSD90ss: from 495 mm (F5.5) to 351 mm (F3.9)
- Illumination: 44 mm
- Lens design: 4 elements in 4 groups, including 2 ED lenses
- Coatings: AS coatings (99% light transmission per surface)
- Connection thread: M84mm, pitch 1 mm (male thread)
- Connection thread for a camera: M60 mm, pitch 0.75 mm
- Filter thread: 60 mm diameter
SCOPE OF DELIVERY
- Focal Reducer V0.71x
- 2 mm Allen keys
- Dust caps
| Batteries included: | No |
| Batteries required: | No |
| Colour: | black |
| Material: | Aluminium |
| Net weight (without access.) (g): | 589 |
| Power supply unit included: | No |
| Total height (mm): | 59 |
| Total length (mm): | 92 |
| Total width (mm): | 92 |
