SEVUN
Sevunscope Advanced 250/1000
Sevunscope Advanced 250/1000
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The large-aperture modular optical system designed to go further
The Sevunscope Advanced 250 f/4 redefines access to large apertures within an advanced mechanical platform. With a 250 mm aperture, you enter a new dimension of light-gathering capability, while benefiting from the telescopic architecture of the Advanced platform, designed to accommodate ambitious optical configurations without the bulk of a traditional tube. This is a very high-performance instrument intended for demanding observers and imagers.
The idea behind the Advanced platform
Instead of a massive and constraining tube, we developed an open platform made of aeronautical-grade aluminum incorporating a telescopic mechanism. This architecture makes it possible to adjust the platform length to accommodate substantial focal lengths, while ensuring a high level of mechanical rigidity. The platform provides the structure, while the modules carry the optics.
What this changes in the field
Controlled transport : The telescope remains fully dismountable and transportable, despite a more substantial structure linked to the telescopic mechanism. This is a deliberate compromise to make large aperture accessible within a scalable platform.
Thermal equilibrium : A 250 mm mirror has significant thermal inertia. The open structure of the Advanced platform allows unrestricted airflow over all surfaces of the mirror, ensuring rapid thermal equilibrium and stable images from the beginning of the night.
Durable design : The use of aluminum combined with high-performance Nylon components (SLS 3D printing) guarantees a rigid and long-lasting instrument. Each unit is assembled and inspected by hand in our workshop. The mechanical structure is guaranteed for life.
A reliable optical system (GSO)
With 56 % more light-gathering power than a 200 mm, the 250 f/4 is a true photon-collecting machine. Its 74 mm secondary mirror limits obstruction while ensuring excellent illumination of the focal plane. Equipped with a 2" rack-and-pinion focuser (with 1.25" adapter), it supports complete imaging trains with perfect stability, while integrating into a platform capable of evolving toward longer focal lengths.
An investment for your lifetime as an astronomer
The key strength of the Sevun system lies in its modularity. As your ambitions evolve, so does your instrument. With the Advanced platform, you retain your mechanical base and can evolve your optical configuration toward other focal lengths or apertures, without calling your primary investment into question.
Technical Specifications
|
Data |
Specification |
|---|---|
|
Effective aperture |
250 mm |
|
Focal length / F-ratio |
1000 mm / f/4 |
|
Total weight (ready to use) |
15.1 kg |
|
Secondary mirror (minor axis) |
74 mm |
|
Linear obstruction |
29.6 % |
|
Focuser |
2" rack-and-pinion (with 1.25" reduction) |
|
True field of view (with supplied 20 mm eyepiece) |
1.36° |
|
Mount interface |
Vixen dovetail (Losmandy on request) |
Magnification capabilities
Useful minimum : 35×
Resolving : 250×
Recommended maximum : 500×
Package contents
The instrument is delivered complete, ready for use on your mount :
Advanced platform : Aluminum structure with integrated telescopic mechanism (6.8 kg).
250 / 1000 optical kit : Primary and secondary modules.
Light protection : Shroud and six pultruded carbon support rods.
Focusing system : 2" rack-and-pinion focuser (with 1.25" reducer).
Included accessories : 6×30 illuminated finder, collimation laser.
UWA 68° eyepiece pair : 9 mm and 20 mm for full immersion from the first night.
System scalability
The Advanced platform is designed to accompany your progression. The chassis remains the same; only the optics evolve. For reference, here is the total weight (ready to use) if you later choose to evolve in aperture :
150 mm configuration : 10.5 kg
200 mm configuration : 11.8 kg
250 mm configuration : 15.1 kg
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