The rigid, modular telescope, scalable and designed to go further
The Sevunscope Advanced 200 f/4 is designed to capture the maximum amount of light within an advanced mechanical platform. Combining a comfortable 200 mm aperture with an 800 mm focal length, it delivers exceptional brightness for both astrophotography and visual observation of diffuse objects, while benefiting from the telescopic architecture of the Advanced system.
The idea behind the Advanced platform
Instead of enclosing the optics in a sheet-metal tube, we developed an open platform made of aeronautical-grade aluminum integrating a telescopic mechanism. This architecture makes it possible to adjust the length of the platform in order to accommodate different focal lengths, while ensuring high 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 disassemblable and transportable, while accepting a more massive structure linked to the telescopic mechanism. A deliberate compromise to benefit from a versatile and scalable platform.
Thermal equilibrium : The open structure allows the mirrors to reach thermal balance naturally and quickly, eliminating the internal air-current effect specific to closed tubes.
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)
The 200 f/4 is a reference for deep-sky imaging. Its 800 mm focal length allows the capture of wide fields and extended galactic structures. Equipped with a 2" Crayford focuser (with 1.25" adapter) and a 62.5 mm secondary mirror, it ensures excellent field coverage for imaging sensors, 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 is its modularity. Your practice evolves ? Your instrument does too. With the Advanced platform, you retain your platform and can evolve your optical configuration toward other focal lengths or diameters, without calling your initial investment into question.
Technical Specifications
| Data |
Specification |
| Usable aperture |
200 mm |
| Focal length / F-ratio |
800 mm / f/4 |
|
Architecture
|
Modular telescopic sliding optical platform |
Platform length |
900 mm + 270 mm extension |
| Total deployed length |
1170 mm |
| Total weight (ready for use) |
13.43 kg |
| Secondary mirror (minor axis) |
62,5 mm |
| Linear obstruction |
31,3 % |
| Focuser |
2" Crayford (with 1.25" adapter) |
| True field (with supplied 20 mm eyepiece) |
1.70° on the sky |
| Mount interface |
Vixen dovetail (Losmandy on request) |
Magnification capabilities
Minimum useful : 29×
Resolving : 200×
Recommended maximum : 400×
Package contents
The instrument is delivered complete, ready for use on your mount :
Plan Advanced : Aluminum structure with integrated telescopic mechanism (6.8 kg).
200/800 optical kit : Primary and secondary modules (5.0 kg).
Protection : Light-shroud skirt and 6 pultruded carbon support rods (0.6 kg).
Focusing : 2" Crayford focuser (with 1.25" adapter).
Included accessories : 6×30 illuminated finder, collimation laser.
UWA 68° eyepiece duo : 9 mm and 20 mm for full immersion from the very first night.
System scalability
The Plan Advanced is designed to accompany your progression. The chassis remains the same; only the optics evolve. As an indication, here is the evolution of total weight (ready for use) if you decide to move to a different aperture later :
150 mm configuration : 11.03 kg
200 mm configuration : 13.43 kg
250 mm configuration : 16.13 kg
